Lenses

Switching from glasses to contacts, and vice versa, can be complicated. That's especially true if you're trying it for the first time.

Any change to your eyewear can often feel disorienting. At the very least, you might need some time to get used to it.

Here are some practical tips for making either switch more manageable.

5 tips for switching from glasses to contacts

Going from glasses to contacts? Listen up.

1. Get your contact lens fitting

Contact lens fitting is the first step before you wear them.

Before wearing contacts, you must get a contact lens exam and fit first. It's when the eye doctor measures your eyes, checks your health level, and helps you search for the right pair of contact lenses.

Remember, not everyone has the same pair of eyes. Yours might be allergic to specific contacts or need specialty lenses for an eye condition.

You also need to consider your lifestyle. Will you wear contacts for work, sports, or special occasions only? Find out your answers to this question and discuss them with your eye doctor.

Lastly, be patient. Your prescription for contact lenses will differ from your glasses, and it might change over time. Some people even go for more than one appointment to find the perfect fit for their eyes.

2. Know the limits of contacts

Listen, just because slipping on some contacts seems convenient doesn't mean they are like that all the time. A pair of contact lenses does have its limitations in real life.

For instance, when you're switching from glasses to contacts for the first time, take note of their expiration date. Is it supposed to last for a month? Or is it only wearable for the day?

Don't wear a pair of contact lenses longer than prescribed, or else you might increase the risk of eye infections. It can also lead to blurry vision, dryness, and irritation.

3. Practice proper lens and eye hygiene

Lens and eye hygiene are necessary if you want to wear them.

Another thing to consider before you wear contacts is the hygiene practices around them. Unlike glasses, where you can wipe and go, contact lenses require more attention and care.

Always follow the eye doctor's instructions on cleaning and storing your lenses. If you haven't used your lenses for a long time, check if you need to disinfect them. Generally speaking, you should clean your lenses after each use.

Contact lenses can also be more fragile than glasses. Keep them away from water at all costs, and make sure your hands are dry and clean before handling them.

Of course, you need to consider your eye hygiene too. Contact lenses can dry out your eyes, so keep a bottle of lens-friendly eye drops on hand.

4. Gradually adjust and acclimate to wearing contact lenses

You might be excited to try a fresh pair of contacts. But if it's your first time switching from glasses to contacts, don't wear them for too long.

Instead, let your eyes adjust and acclimate to how the contacts feel. At the very least, wear them only for a few hours every day, for the first week so that you can get used to them.

5. Carry your favorite glasses when wearing contacts

It's always practical to carry a pair of glasses anywhere, even when wearing contacts. Remember that you shouldn't wear contacts too long and that the spare glasses can be handy.

As mentioned earlier, contact lenses can irritate your eyes. They can prove to be a hassle when you're working. Some workplaces even banned using contacts, or at least they still require you to wear protective eyewear.

It will be a double whammy if you're allergic to pollen and dust. Wearing contacts during spring and summer might irritate your eyes more than ever.

5 tips for switching from contacts to glasses

If you're going from contacts back to glasses, here are some tips to help.

1. Get used to the weight of your glasses

The weight of eyeglasses might feel like a surprise for first-time users.

The first thing you'll feel when you switch to eyeglasses is their weight. There's also the consideration of frame size and lens material. These affect weight, and you might feel some pressure on the bridge of your nose and around the temples.

Remember, it's not the specs for you if it's too tight or heavy on your face. Frames that pinch certain areas of your face can lead to headaches. Also, adjust the nose pads when necessary so that they won't slip off your nose throughout the day.

If the newfound weight is bothering you, you can consider switching to a lightweight pair of frames, such as wire frame, rimless, or semi-rimless frames.

Our lightweight November frames.

2. Store your contacts safely

As you whip out your fave spectacles, double-check if your contact lenses are safe and secured. Here are some general guidelines on how to store them properly.

• When switching to glasses, keep your contacts in its lens storage case.
• Replace the storage case every three months, and clean it after every use.
• Keep your contact lenses at room temperature. Don't stick them inside your fridge.
• Don't store your contact lenses in any other solution besides the prescribed one.
• Use a fresh solution only to clean and store the lens. Don't use the old one, and never mix the two.
• Follow the eye doctor's instructions on how to clean the lens and change the solution.

3. Choose the right type of eyewear

Choosing the right type of glasses depends on a few factors.

If you look up glasses online, you'll see a ton of options that you can try and buy. And honestly, all of it can be overwhelming. So, we've compiled a few simple tips and tricks on choosing the right type of glasses for you.

First off, consider your lifestyle. Do you live an active life, or are you more on the chill side? You'll need a pair of glasses that would suit either or both. You can get multiple pairs for different occasions if your budget allows it!

The second tip is to look at yourself in the mirror. Check out your face shape and what frame shapes will suit you best. For the most part, angular faces can match with round frames, while soft features balance out with sharp shapes.

For the third tip, get a complete eye exam before shopping for eyewear. After all, depending on your eyes' health, you may need a prescription.

And lastly, try the glasses on! You'll never know if it's the right one if you don't wear it on your face. You can also virtually try on eyeglasses online, so you don't have to leave the comfort of your home.

4. Adjust to potential eyewear discomfort

Switching to glasses can be easy and practical, but it can also feel like a surprise if you need to get used to it. For instance, objects might look bigger or sharper with your specs on, therefore, more overwhelming to your senses.

So, let yourself adjust over time. Don't rush into it. Wear your glasses a few hours a day to start. Also, try to do it in the evening, so there won't be too many stimuli.

If you're staring at a screen for hours now, get a pair of blue light glasses. Those have a protective layer against blue light. With that, you can finish your work without damaging your eyes.

5. Protect the lens from blurs and scratches

Don't forget to maintain the cleanliness of your glasses.

Remember, gently clean your glasses only with proper lens cleaning cloths. Don't rub them on your shirt, a towel, or a napkin. If it didn't come with anything, get a soft, microfiber cloth that's guaranteed to be lens-friendly.

Wiping your lens with any other material can lead to tiny scratches on the surface. It can also make them blurry. If there's too much damage, you'll need to get it replaced.

Remain essential even when you have contacts

While donning a fresh pair of contact lenses feels nice, it's not entirely convenient for all your waking hours. Wearing contacts has its pros and cons. So, don't hesitate to always bring your glasses with you in any situation.

After all, you won't know when switching between one and the other may be necessary. This is also the reason why you have to keep both your contacts and glasses clean and safe. Follow your eye doctor's care guidelines for contacts and glasses to avoid health risks.

Once upon a time, eyeglasses were just clunky cuts of glass. They improved their vision but couldn't handle reflections very well.

Today, most lenses come with an 'anti-reflective' or 'anti-glare coating' to help improve optical clarity.

From a customer perspective, there's usually not much difference between an 'anti glare' and 'anti reflective' coating. An eyeglass company that offers either one will usually cover all the important bases. However, there are some subtle differences in how these coatings can function – explained below!

What is an anti-reflective coating?

Simple! An anti-reflective coating reduces the amount of reflective light on eyeglasses.

When you talk to someone wearing their eyeglasses in a well-lit place, you'll notice that their eyeglasses reflect some of the light, obscuring their eyes.

With an anti-reflective coating, you can see through their eyeglasses more clearly. Not only can you make better eye contact with each other, the wearer can see more clearly – with fewer distracting lighting effects!

An anti-reflective coating can be only about 0.2 microns thick, almost as thin as a soap bubble!

This coating is not the same as a smartphone or computer screen protector, which is pasted on the surface by hand. Instead, the eyeglasses are placed in a vacuum chamber and exposed to a metal oxide that bakes the AR coating on the surface.

In other words, the coating becomes one with the eyeglasses.

Such coatings can differ depending on the manufacturer of the lenses. For example, Essilor uses a Crizal Sapphire coating that helps to reduce visible light reflections from 360° – all ensuring the lenses have absolute transparency.

So – what is an anti-glare coating on glasses?

Some eyewear companies will talk about both anti-glare and anti-reflective coatings. Some will use either term interchangeably – or may talk about them as separate things.

At the end of the day though, an anti-glare coating essentially does the same thing as an anti-reflective coating.

If you want to dig very deep – the distinction is usually that anti-reflective coatings can protect against both internal and external light.

In contrast – anti glare coatings deal only against external light sources entering the glasses.

How does light reflect off different surfaces?

All physical objects, shiny or not, reflect a certain amount of light.

Even non-shiny surfaces reflect light. You can see the world around you because the light reflected off objects and surfaces, no matter how little, enters your eyes.

Things that don't reflect light or only reflect a very little amount of light, such as air or clear water, tend to be translucent.

There's a thing called 'interference' that may also affect how light is reflected off a surface (or how your eyes see). This occurs when light beams from two opposite directions cross paths.

The best example is the light reflection on a soap bubble. The swirling cloud of different colors you see on its surface results from light interference.

Soap bubbles glimmer thanks to interference.

When the light passing through the bubble's outer surface interferes with the light reflected by its inner surface, you see an explosion of colors.

While thicker than a bubble, your eyeglasses experience the same phenomenon. Light is reflected both by their interior and exterior surfaces.

Eyeglasses with no anti-reflective coating reflect about 8% of the light it receives, meaning only 92 percent of it makes it into your eyes. This can lead to a decrease in visual clarity.

Benefits of anti-reflective and anti-glare coatings

When an anti-reflective or anti-glare layer is added to a lens, only a very small percentage of the light is reflected.

Anti-reflective coating also increases contrast, making colors more vivid and crisp. Without it, the images you see are paler and fuzzier. And who wants that?

Both coatings improve the clarity of the wearer's vision and reduce reflectivity.

AR and AG coatings can help the wearer see more clearly.

Here are some applications of these amazing optical technologies:

• Better optical clarity for the glasses wearer.
• Reduces distracting glare that can cause eyestrain and headaches.
• When conversing with another person—a client or an interviewer—your eyes are more visible to them, which is critical in establishing trust.
• The anti-glare coating may also disperse excess light that might otherwise hurt your eyes.
• It's easier to do things like drive.
• Look better on camera since wearing glasses without anti-reflective coatings will reflect your ring light.

How to tell if your eyeglasses have AR or AG coatings

Keep in mind that the purpose of protective coatings is to manipulate light reflection. Therefore, some of its properties also tend to change. The most noticeable tends to be a change in the reflection's color.

Eyeglasses without these coatings will have a white, regular reflection, while those with an anti-reflective coating can sometimes reflect a greenish-purple reflection. The lenses can sometimes also appear slightly darker because of the additional layer.

What other lens coatings are there out there?

Any good optical lens manufacturer will add some forms of coatings to eyeglasses to help make it easier for the wearer to look after these glasses out in the wider world.

Here at Door2USA Prescription Glasses, our glasses include scratch resistant coatings for added durability and hydrophobic coatings. Read up more on our lenses here.

Hydrophobic coatings are also very helpful for keeping your lenses cleaner for longer and reducing the smudge marks left by fingerprints. Moisture from your skin will quickly come off should you accidentally touch it.

That's not to say you don't have to clean your glasses regularly to prolong their lives!

Wrap-up: Lens coatings can make all the difference

Anti-reflective and anti-glare coatings are just two of the latest advances in optical technology. As we discover new ways to harness and manipulate light, we can expect more visual correction solutions in the future.

Taking advantage of available options is also critical as they help improve visual clarity. Anti-reflective and anti-glare coatings are worth trying to have a high-contrast and clearer image of the world.

If you're still using standard non-coated eyeglasses, this might be the best time to get a new pair.

Ever heard of convex or concave lenses and wondered what their difference is? These lenses help adjust how we see things, similar to the concept behind telescopes or cameras.

In this article, we'll dive into the fascinating world of lenses and explore how they shape our understanding of optics.

What's the difference between concave and convex lenses?

Lenses are often round, with one or both sides curved like a bubble or a cave. Source: Britannica

Lenses are often circular, with one or both sides curved like a bubble or a cave.

Convex (converging) lenses are thick in the middle and get thinner toward the edges. They bend light beams inwards and meet at the focal point, making them the go-to for magnifying and creating sharp images.

Meanwhile, the concave (diverging) lens is flat at the center and thicker at the edges. They spread out beams, which are great for spreading light and creating smaller, less focused images.

A single lens comes with two opposite surfaces, which can either be both curved, or one can be curved while the other is flat. Lenses can be classified based on their surfaces:

• BiconvexBoth surfaces bulging outward.
• Plano-convexOne surface is flat and another curved outward.
• Concavo-convexOne caving inward and another bulging outward.
• BiconcaveBoth surfaces caving inward.
• Plano-concaveOne surface is flat and another caving inward.
• Convexo-concaveOne bulging outward and another caving inward.

These lenses can bend light rays at different angles because of their curvature. This means that an entire beam of light can be focused on a single point or appear to spread out in every direction.

Eyeglasses have single lenses, also used in contacts, pocket magnifiers, signal lights, projection condensers, and even on simple box cameras.

Compound lenses are composed of various lenses combined in a tube (to correct aberrations that happen when light rays fail to meet at one focus due to defects or limitations in a lens). They're used in complex instruments like cameras, microscopes, and telescopes.

How do lenses affect our eyesight?

Lenses have come a long way since their early beginnings. In ancient times, people would use simple glass that could magnify things to help them in their tasks.

It wasn't until the 13th century that prescription lenses were invented, allowing those with vision impairments to see clearly. Fast forward to the 17th century, and lenses were used in simple microscopes and telescopes, unlocking the wonders of the microscopic and astronomical worlds.

As technology advanced, so did lenses, leading to the development of camera lenses and modern eyeglasses.

These days, lenses are pieces of transparent glass (or plastic) that can bend and direct light beams. When light from an object passes through a lens, it gets focused so that we can see an image of that object.

A lens is a piece of transparent glass (or plastic) that can bend and direct light beams.

Whether a simple lens made of a single piece of material or a compound lens with multiple pieces arranged in a specific way, the result is the same: a focused image. The lens differs from a prism, which only bends light without focusing.

Which do I need, concave or convex?

Concave lenses are for nearsightedness, while convex lenses are for farsightedness. Lenses with concave and convex surfaces can correct astigmatism. Source: ResearchGate

A consultation with your eye doctor can help determine which lens type best suits your needs. They'll be able to perform the necessary eye exams and give you a precise prescription for your lenses. Not only that, but they can also answer any questions you may have about the pros and cons of each type of lens.

Generally, concave lenses are used to correct nearsightedness (myopia), while convex lenses are used to correct farsightedness (hyperopia). However, you might not have either eye condition. You may have other eye disorders like astigmatism. This condition can be corrected by lenses with a combination of concave and convex surfaces.

Only a comprehensive eye exam done by an ophthalmologist can tell you the condition of your eyes, whether you need prescription eyewear, and what type of lenses you need to use.

Other lens considerations to keep in mind

Aside from whether a lens' shape is convex or concave, here are some other considerations that affect lens choice when picking out eyewear.

Lens material affect weights and durability

When it comes to picking out eyeglass lenses, there are a variety of materials to choose from. The most common types are plastic and glass lenses, but there are also polycarbonate, Trivex, and high-index lenses.

Plastic lenses tend to be the most affordable and lightweight option, making them popular for everyday wear. Glass lenses are durable and scratch-resistant, but they can also be heavy and uncomfortable.

Polycarbonate and Trivex (lighter, more transparent, and thicker than polycarbonate) lenses are impact-resistant—ideal for safety glasses or children who tend to be clumsy.

Lastly, high-index lenses are perfect for people with strong prescriptions as they are thin and lightweight, making them comfortable for long-term wear.

No matter which material you choose, consult your eye doctor to ensure the best fit and vision for you.

Lens coatings improve or change lens functionality

You can get many different coatings on eyeglasses lenses. There's blue-light blocking, which can help you protect your sleep patterns and reduce eye strain from staring at a computer screen all day. There's scratch resistance, which is great for those clumsy moments when your glasses fall off your face (we've all been there).

And there's even UV protection to protect your eyes from the sun's harmful rays.

Here at Door2USA Prescription Glasses, we make sure all glasses lenses come with hydrophobic, anti-glare, and scratch resistance coatings by default.

You can experiment with various frame styles regardless of lens type

Choosing the right frames for your eyeglasses is about hitting that note between functionality and style. With so many different frame styles available on the market, deciding which one is perfect for you can be overwhelming.

From square frames to aviators, round frames to cat-eye, and even rimless options, there's a design out there for everyone. Picking out the 'perfect' one for you requires considering your unique face shape, skin tone, and personal preference.

The best lenses are the ones that meet your needs

It's essential to make sure your eyewear fits not only your lifestyle and style but also your prescription needs.

At Door2USA Prescription Glasses, you can not only order your prescription glasses online, but you can also use Door2USA Prescription Glasses' virtual try-on tool to see if your selected frames suit you!

Have you ever asked yourself, 'Do I need glasses for reading?'

If you're unsure whether the time has come for you to wear them, you've come to the right place. In this article, let's get to know reading glasses better and explore the available types.

The reality: our eyes change as we age

Aging can bring a lot of changes to our vision, like having difficulty seeing things up close.

Let's face it. Our vision doesn't stay at its best forever. There will come a time when your eyesight changes, especially if you're not so watchful over your eye health.

Generally speaking, age will bring about changes to your eyes. As you grow older, the lenses in your eyeballs will change shape and become less flexible. This in turn will make it harder for you to focus on things up close.

These changes are known as presbyopia, an age-related eye condition that affects your near vision. It usually starts to kick in from the age of 40 and above. In the US, at least 83 to 88.9% of adults are diagnosed with presbyopia.[1]

Other age-related changes that might occur to your eyes are the following:

• Reduction in pupil size
• A full or partial loss of peripheral vision
• Changes to color perception

Once your eyes go through this transformation, you might start asking yourself if you need reading glasses.

Chances are, your eye doctor will prescribe you a pair after you go through an eye exam. With a pair of reading glasses, you can magnify text to help you read more easily. In the process, you'll also experience less eye strain and be less likely to hurt your eyes, since you can now focus without squinting too hard.

Telling the signs: do I need glasses for reading?

Squinting can be one of the obvious signs that you need reading glasses.

If you feel like age is catching up on you, the best step is to always consult your doctor to assess your condition. Before that, here are some tell-tale signs that you need a pair of reading glasses stat.

1. Your vision's fuzzy and out of focus

The thing with presbyopia is that its health effects are gradual. You might not notice it now, but pay attention to how your eyes focus on objects or people. Can you see them clearly, especially when you're close to them?

If they appear fuzzy or blurry, or simply out of focus, it's a definite sign you need reading glasses.

2. You can't read the small print off of menus or receipts anymore

Test your vision by doing this: Go to a restaurant with your family or friends, and try reading out the small print on the menu. For a bigger challenge, try scanning the receipt with your eyes.

If you can't do this with your naked eyes, it's a pretty clear sign that you need reading glasses soon.

3. Eye fatigue and strain happen way too often

Whenever you feel something amiss in your body, it's something you shouldn't brush off. For instance, it's not normal for your eyes to get droopy and sore after reading or watching a show.

In 2018, researchers found a clear link between eye fatigue and presbyopia. Hence, letting that sore feeling in your eyes go undiagnosed or untreated for an extended period could put you at a higher risk of presbyopia.

4. Headaches become part of your routine

In connection with eye strain and fatigue, headaches can happen due to presbyopia.

Imagine this: your eyes would try to process everything in front of you, but they can't. Thus, your brain would get jumbled and exhausted due to vision errors. When you attempt to read anything, it turns into a literal headache. If this becomes a regular occurrence, reading glasses may be needed.

5. You start holding materials at arm's length

Presbyopia affects your focus. If you can no longer read phones or books at a close, normal distance, you'll have no choice but to hold them at arm's length to read them clearly.

Once you notice this habit developing, it's a sign that you need reading glasses ASAP.

6. You catch yourself squinting more often

When you squint, your eyes narrow and allow only a small amount of light to enter the center of your lenses. Thus, it can help your eyesight focus better.

However, too much squinting is not a long-term solution for deteriorating near vision. If anything, it can be detrimental to your overall vision in the long run. If you're squinting more often than before, it may be time to look into reading glasses.

Reading glasses come in various flavors

Reading glasses come in three variants: over-the-counter, bifocal, and trifocal.

So, you've decided to get your first pair of reading glasses. What next?

Reading specs have a few types, depending on what you need. Here are the three main options and how they can help.

1. Over-the-counter reading glasses

For the most affordable choice, you can get over-the-counter reading glasses which are readily available at most optical shops and drugstores. They come in different strengths, so if you're not sure which one's right for you, schedule an eye exam and get a prescription first.

However, the slight catch is that over-the-counter specs might be limited in some areas. For instance, if you have a prescription for other eye conditions as well, you'll have to go to an eye doctor and get a more customized pair.

2. Bifocals

Do you find it difficult to read text up close and see things from far away all at once?

If the answer's yes, you need bifocal glasses. These are designed for people with both myopia (a.k.a. nearsightedness) and presbyopia. With bifocal lenses, you won't have to keep switching from one pair of glasses to another.

Usually, the top part of bifocal lenses is for distance vision, while the lower half corrects near vision. Try the double magic for yourself with our stylish cat-eye Charisma frames.

3. Trifocals

If you require multiple prescriptions and want a more seamless, gradual transition between each range of vision, trifocals (e.g. progressive glasses) are the way to go. This type of lens can correct three ranges of vision: near, intermediate, and far.

The top part of a trifocal lens is for looking far ahead, and the middle part is for intermediate vision, which is for seeing things slightly further than at arm's length. Lastly, the lower part of the lens corrects near vision.

If you're confused about how to look through these lenses, don't worry. Trifocal lenses often have lines in them to guide you on which zones to look through. Get this triple visual power for yourself with these snazzy browline Steven frames.

See Steven

'Do I need glasses for reading?' Perhaps

As with any other vision issue, don't wait until it's too late. At the first sign of your eyesight faltering, you should get your eyes checked immediately.

Getting an eye exam in time won't just save your eyes, it'll also save your pocket in the long run as more severe issues mean more expensive treatments. For more ways to keep your eyes healthy and protected, check out Door2USA Prescription Glasses' blog.

References

• 'Presbyopia by the Numbers: Who Is Affected by It?', Presbyopia Physician.

Mirrored sunglasses have become a must-grab accessory for many people looking to protect their eyes from the sun and make a fashion statement at the same time.

Through a special reflective coating that's applied on one side of the lenses, these shades can reduce brightness while still enabling you to see clearly.

Let's look at the pros and cons of mirrored sunglasses, the types available, and the factors to consider when choosing the best pair for you.

The pros of mirrored sunglasses

Mirrored sunglasses aren't your ordinary pair of sunnies, and it's not just because they look good. Here's how wearing a pair can benefit you:

1. Great UV protection

Mirrored sunglasses are a great way to limit exposure to the sun's harmful ultraviolet rays.

Not only do they make it easier to transition from indoors to outdoors, but some types also provide better UV protection than regular sunglasses.

Some modern mirrored lenses even offer complete ocular protection against both UVA and UVB rays through their multi-layered coating.

2. Reduced glare

With mirrored lenses, light is reflected in multiple directions instead of directly hitting your eyes.

This eliminates the glare coming from sun rays bouncing off windshields and other reflective surfaces, as well as prevents painful headaches caused by overly bright light.

Also, since the brightness of incoming light is lowered, your eyes experience less strain while driving in bright light conditions or engaging in other outdoor activities.

3. Enhanced style and fashion

The sleek and contemporary look of mirrored shades can instantly jazz up even the most basic outfit while still being comfortable and practical enough to wear all day.

Plus, they come in virtually every color imaginable, offering many options to cater to every type of fashionista.

Mirrored sunglasses provide sun protection, reduce glare, and make for pretty snazzy accessories.

The cons of mirrored sunglasses

Like most types of eyewear, mirrored sunglasses do have their drawbacks as well.

1. Reduced visibility

Wearing mirrored shades has a major drawback many may overlook: reduced visibility.

Its effectiveness in blocking out light could impair your ability to see your surroundings under low-light conditions.

While driving, you'll need to remove your mirrored shades if you must go through a tunnel.

Otherwise, they may affect your vision and put you and other drivers at risk for accidents.

2. Distortion of color perception

As cool as mirrored sunnies look, it's important to know they can distort color perception as well.

Their reflective coating changes the way colors appear to you, sometimes making them look brighter or more muted than they are.

This can be a disadvantage in activities that require accurate color perception, such as drawing, painting, and even driving.

3. Potential discomfort

For some, mirrored sunglasses can become cumbersome and uncomfortable, particularly if they are ill-fitting or of poor quality.

Instead of simply looking stylish, a loose-fitting pair may put more strain on both sides of your head and even give you headaches if worn for to long.

Types of mirrored sunglasses

Mirrored sunglasses now come in different varieties, all of which keep your eyes protected while giving your look that extra flair.

1. Classic round frames

Round mirrored sunglasses offer a vintage look with a modern twist.

These glasses feature round lenses with metal frames that are often thicker than other styles, making them more durable.

Square and diamond-shaped faces look best in round frames.

Round mirrored sunglasses offer a vintage look with a modern twist.

2. Aviators

Originally designed for pilots in 1936, aviator mirrored sunglasses have since been adopted by millions as timeless accessories.

These classic frames feature metal rims with teardrop-shaped lenses.

The signature detail of aviator sunglasses is the double bridge between the eyes, which helps add support for heavier lenses.

3. Cat-eye

These unique frames make a statement with their bold, angled lines and upturned lenses.

Think Audrey Hepburn à la Breakfast At Tiffany's, but with mirrored lenses.

Cat-eye sunglasses are perfect when you want to add a dash of retro chic to your look.

4. Square and rectangular frames

Square and rectangular frames are becoming increasingly popular for mirrored sunnies.

They make an interesting alternative to typical round frames and still give you a classic look.

These shapes flatter oval and round faces the most.

5. Wraparounds

One of the most popular designs for mirrored shades, the wraparound keeps your vision wide open in all directions, giving you a full, unhindered view.

With their curved lenses, these sunglasses offer optimum protection and coverage for both your eyes and the skin around them.

Aside from being fashionable, they're also popular in extreme sports due to their comfortable yet secure fit.

Mirrored vs. polarized sunglasses

Both help to improve visibility in bright light conditions and reduce glare, but each has its own distinct applications.

Mirrored lenses are best for activities like cycling, motorcycling, climbing, and skiing.

The reflective coating reflects bright, direct light, protecting your eyes and allowing you to see clearly in outdoor settings.

Polarized glasses are usually used for fishing, boating, and other water activities, where bright light tends to be reflected off a flat water surface.

These sunglasses can block horizontal light from the surface, allowing you to see better.

Nowadays, it's possible to have your sunnies' lenses customized to be both polarized and mirrored.

What to consider when choosing mirrored shades

With so many mirrored sunglasses on the market, picking a pair that perfectly complements your face shape and activity level is essential.

First off, do some research on which frames are most flattering for your face shape.

For example, if you have a round face, you'll want to avoid mirrored sunglasses that are too small or circular. Instead, opt for a pair that is more square or rectangular.

Consider your activity level as well. If you often engage in intensive physical activities such as running or hiking, get a pair that'll fit tightly and securely on your face.

Glasses with rubberized nose pads or straight arms will provide better grip and comfort for more active lifestyles.

Outdoor enthusiasts should also prioritize sturdy materials and lenses with strong UV protection when selecting their next pair of mirrored sunglasses.

Intensive physical activities demand sunglasses that fit tightly and securely on your face.

Take some time to think about your personal preferences. Do you like smaller or larger lenses? Do you want it to have a tint, and if so, what color?

Additionally, get your sunglasses professionally fitted so that they're a comfortable fit that you'd be happy to wear all day.

Ultimately, mirrored sunglasses should stand up to everyday wear while providing your eyes protection from the sun's harsh rays.

Are mirrored sunnies right for you?

Like any other pair of glasses, it's worth taking time to weigh the pros and cons of mirrored sunglasses before making your final decision.

They can protect your eyes fantastically from the sun's UV rays, help you see in bright light conditions, and instantly elevate an outfit.

However, your ability to see and perceive colors may be affected, and you might feel uncomfortable wearing mirrored shades.

If you lead an active lifestyle or love taking part in sporty activities, the mirrored sunglasses route is one worth exploring.

With over 75% of Americans needing vision correction, glasses have become integral to the everyday routines of many. But how exactly do they help us see better, and why are they favored over other corrective methods?

Today, we break down the interesting science behind glasses, and how they're able to transform our vision from blurry to crystal clear.

A brief history of prescription glasses

Italian monks were the first to make glasses in the 13th century, which worked like magnifying glasses. Source: @gabrielsmirror on Tumblr

Glasses have been around for centuries, but they haven't always existed in the form we're all familiar with now. The earliest known record of specs dates back to the 13th century, and they were essentially two magnifying lenses connected and perched on top of your nose.

By the 18th century, temple arms were created so that the lenses would stay put when worn, which eventually led to the development of wireframes. Shortly after, innovations in eyewear began to accelerate, with some notable milestones being the introduction of 'scissor glasses' that could be tucked neatly into one's pocket, Benjamin Franklin's invention of bifocal lenses, as well as the conception of cylindrical lenses for astigmatism.

Come the industrial age, manufacturers started exploring different frame materials and shapes, which gave rise to the fashionable styles we all know and love now, such as the cat eye, browline, and oversized silhouettes.

How do human eyes work?

The brain works together with the eye to turn electrical signals converted from light into the images we see. Source: Thoughtco.

Our eyes are complex and hardworking organs that allow us to receive and process visual detail, which in turn enables us to make sense of our surroundings. It begins with light passing through the cornea, which bends light to help our eyes focus. Next, the light enters our eyes through the pupils, with the irises controlling the amount of light coming in. This is also what causes our pupils to dilate or contract depending on the time of the day.

After that, the lens will fine-tune and adjust the light depending on the distance of the object in focus, letting the appropriate amount of light enter the nervous tissue at the back of our eyes (a.k.a. the retina). When the light finally hits the retina, special cells called photoreceptors transform the light into electrical signals to be sent to the brain. The brain then processes these signals into the images you see.

How prescription lenses correct vision problems

Glasses are one of the easiest ways to correct refractive errors and see clearly.

Now that you know how normal vision takes place, let's get into some common conditions that cause eyesight problems and how glasses can fix them:

Nearsightedness

Also known as myopia, nearsightedness is a type of refractive error that makes distant objects appear blurry. It occurs when the shape of the eyeball is too long from front to back, making light focus in front of the retina instead of on it. Myopia can be congenital or developed anytime from childhood to adulthood and is often linked to one's lifestyle choices (e.g. prolonged time spent on close-up activities such as looking at computers and other smart devices, as well as reading)

Luckily, myopia can easily be corrected with single vision lenses, which bend the light properly to reach the correct spot on the retina. You may notice that the lenses are a little thicker around the edges, and are distinguished by a minus (-) sign on your prescription.

Farsightedness

Scientifically called hyperopia, farsightedness is the exact opposite of nearsightedness, and causes nearby objects to look blurry. Hyperopia happens when the shape of the eyeball is too short from front to back, which makes light focus behind the retina instead of on it.

Just like myopia, hyperopia can also be congenital or developed at any point in one's life. A lot of children are born with farsightedness, but this usually disappears as the eyeball develops and increases in length. However, hyperopia will persist if the eye doesn't grow enough, thus continuing into adulthood.

This refractive error can also be corrected with single-vision lenses designed for farsightedness, which are thicker at the center and distinguished by a plus (+) sign on your prescription.

Astigmatism

Astigmatism is another common eye problem that causes your vision to look blurry or distorted. It occurs when your cornea has a slightly different shape than normal, making the light bend differently as it enters the eye. Astigmatism can be hereditary, but it can also be developed later on in life or after an eye injury or surgery.

To correct astigmatism, special cylindrical lenses are needed to correct the way the light hits the retina. Aside from the usual spherical (+/-) prescription, you'll also have a cylinder (the amount of astigmatism correction you need) and axis (the specific lens angle needed to correct your astigmatism) measurement to account for.

How to get a prescription for glasses

Your eye doctor will help provide your prescription.

When correcting vision problems such as refractive errors, it's important to get as precise of a prescription as possible to achieve perfect vision. To do so, the first step would be to consult your go-to eye doctor and take an eye exam. For this, you'd want to acquaint yourself with your family's history, such as whether your parents or siblings have eye conditions or diseases that may have an impact on eye health.

Following this, your doctor will then assess your eyesight through a variety of visual acuity tests. If you'd like to know more about what to expect during an eye examination, we've got an in-depth blog post you can check out.

Finding a glasses frame that fits you

Just because you need glasses to correct your vision doesn't mean that you'd have to compromise on style. Today's frames are far from boring, and come in so many different shapes, sizes, colors, and materials that'll bring out your best self.

When picking out frames, some factors you'd want to take note of are your face shape and natural coloring. Having a good understanding of your features will help you figure out which types of frames suit you the best and make your search for the perfect pair a lot easier. We at Door2USA Prescription Glasses also have a handy virtual try-on that you can check out, so you can see how our glasses look on you from the comfort of your home.

Look and see your best with Door2USA Prescription Glasses

And there you have it! We hope this blog was able to answer all the questions you may have about prescription glasses. They may take a little time to get used to at first, but nothing beats being able to see the world clearly.

For a wide selection of trendy, functional, and affordable glasses, check out our extensive collection of frames here at Door2USA Prescription Glasses.

Frequently asked questions

1. How often should I go for an eye exam?

While recommendations may vary depending on age and medical history, most adults are advised to have an eye exam every two to three years.

2. How long does it take to adjust to new glasses?

It can take anywhere between a few days to a couple of weeks to get used to your glasses, especially if you're a first-time wearer or have just switched to a higher prescription.

3. Do you need a prescription to order glasses?

Some types of glasses, such as readers, can be purchased over the counter without a prescription. However, those with farsightedness or more than one refractive error will need a doctor's prescription to have the lenses customized to their specific needs.

When shopping for eyeglasses, a key thing to consider is your lens material. To start with – should you get plastic or polycarbonate lenses? Many people get confused about the differences.

In a nutshell: polycarbonate lenses are more durable, lightweight, and thin than regular CR-39 plastic lenses, though CR-39 can offer slightly better optical performance (although the difference is almost negligible). Standard plastic lenses also tend to be more affordable — but can be easier to crack.

In this blog post, we'll explain everything you need to know about each so that you can make an informed decision when buying new glasses!

An overview of plastic lenses

What are plastic lenses?

Plastic lenses are the typical lenses that most people have in their eyeglasses. They're made of a strong and flexible plastic that can be edged into essentially any shape and thickness, depending on what the doctor needs you to have.

Standard CR39 plastic lenses come in different thicknesses, which are differentiated by a number called the lens index. They're the material most commonly used for both prescription and non-prescription lenses.

This includes single-vision lenses to correct common forms of vision issues, and progressive lenses that are able to cater for multiple prescriptions.

A quick history of plastic lenses

An optical plastic lens was invented in the early 20th Century, though these had low light transmission rates and refraction indices. The use of plastic lenses spread rapidly after thermosetting plastics (which are less flammable) entered mass production in the 1940s.

One such type of lens was made from CR39 plastic, which is still widely used today. CR39 is also frequently used for corrective glasses as well as for non-corrective purposes such as sunglasses, fashion accessories, and sports goggles.

Pros of plastic lenses

• LightweightPlastic lenses are very lightweight and, therefore, comfortable to wear since your frames won't rub so heavily on the nose.
• Affordable plastic lenses are very easy to manufacture and don't come with a high price tag. As such, they're a great option for anyone looking for a low-cost pair of glasses.

Cons of plastic lenses

• They can get scratched easilyPlastic lenses can be prone to scratches and scuffs, which means they need to be replaced if they aren't equipped with a scratch-resistant coating.
• They bend and break more easilyPlastic lenses are also much more prone to bending and breaking than polycarbonate lenses, which means they can become unusable if dropped or placed in hot conditions.

An overview of polycarbonate lenses

What are polycarbonate lenses?

Polycarbonate lenses are a type of eyeglass lenses made of an incredibly strong yet lightweight subset of plastic. They're designed to withstand impact, correct vision issues, and support more active lifestyles.

Polycarbonate lenses are usually thinner and lighter than other types of lenses, which makes them ideal for people who want to wear glasses but don't want to sacrifice style for durability.

Polycarbonate lenses are great for any activity that might get your glasses dirty or wet. They're also a fantastic choice if you wear prescription eyeglasses daily and need a sturdy lens that can stand up to your lifestyle.

Because of their durable material, they're prone to scratching or breaking and are ideal for sporty activities like running or cycling, as well as outdoor activities like hiking or camping.

Polycarbonate lenses are ideal for sports.

A brief history of polycarbonate lenses

Polycarbonate lenses are a relatively new lens technology. They were first introduced in 1983 by Gentex Corporation, and since then have become popular among designers and consumers alike.

They offer a higher refractive index and are incredibly strong and durable, which makes them ideal for use in products such as glasses that need to be thin enough to fit comfortably on someone's face but also need to be able to withstand regular wear and tear.

Pros of polycarbonate lenses

• Impact resistant polycarbonate lenses are some of the most impact resistant lenses on the market, which makes them ideal for use in sunglasses and other products that will be worn by people who do a lot of active activity.
• Lightweight and comfortable Polycarbonate lenses have a high refractive index, which means they can be a thinner and more lightweight solution for your prescription when compared to plastic lenses of the same power. This also makes them more comfortable and easy to wear for extended periods.
• UV protection polycarbonate lenses provide excellent UV protection, which makes them ideal for use in glasses and other products that need to protect the eyes from the sun's harmful rays. At Door2USA Prescription Glasses, our polycarbonate lenses have an additional UV coating added on top to maintain the clarity of the lens.
• VersatilityPolycarbonate lenses can be used in a wide range of products, including sunglasses and safety glasses. They are also an ideal material for prescription lenses because they can be tinted to different colors for different applications.

Cons of polycarbonate lenses

• CostPolycarbonate lenses are more expensive than other types of plastic, so, polycarbonate lenses tend to require a larger budget. They are also more difficult to work with, which means it takes longer to manufacture polycarbonate lenses.

Plastic vs. polycarbonate: at a glance

Here's a quick overview of the differences.

Features	Polycarbonate lenses	Plastic lenses
Thickness	30% thinner than plastic	Thicker
Weight	Even lighter than plastic	Lightweight
Optical clarity (Abbe value)	30	58
Impact resistance	10x sturdier than plastic	More impact-resistant than glass but less than polycarbonate
Tensile strength	44.9kgf	6kgf
UV protection	100% (however, they still require an additional UV coating to prevent them yellowing)	Needs UV coating
Cost	$160 on average	$75 on average

Frames recommended for polycarbonate lenses

Here at Door2USA Prescription Glasses, we specialize in making affordable and stylish glasses for all sorts of needs, from fashion to sports to outdoor activities.

The great news is that polycarbonate lenses can be fitted into virtually any style of frame! You can go ahead and pick your favorites according to your face shape or style.

Our favorite full-rim picks for polycarbonate lenses

You can wear polycarbonate lenses with virtually any full-rim style.

Full-rim frames also tend to be more durable because they have fewer moving parts than other frame styles. This can make them a little more suitable for sports and other outdoor activities, for those times you don't want to wear contact lenses.

Our Madison frames are the perfect blend of vintage and modern styles, and offer full-rim durability. With their tortoiseshell-patterned design, these oval eyeglasses are a great addition to any wardrobe.

The Madison frame in tortoiseshell.

Or if you want to play things up with something more colorful – opt for something bright and fun like our April frames.

The April frame is in bright yellow.

Our favorite rimless and semi rimless picks

Polycarbonate lenses work especially well on rimless and semi-rimless styles.

Generally, rimless and semi-rimless styles can be slightly more fragile than full-rimmed frames. However, the added durability of the polycarbonate material means that these glasses should hold up much better for everyday use than your average plastic lenses.

Our classic tortoise shell glasses are a great choice for those who want to add sophistication and style to their wardrobe.

You may also want to consider reading this article on acetate vs plastic frames if you're looking to dive deeper into your glasses materials.

Polycarbonate lenses vs plastic: which is the winner?

And that's it! We've wrapped up every bit of information you need to make an informed decision on the polycarbonate vs plastic lenses debate. Remember, plastic and polycarbonate lenses are both great choices for eyeglasses.

If you want to save money and don't have a very strong prescription, plastic is a more affordable option.

However, polycarbonate lenses win big-time in the areas of durability, thinness, and lightness when compared to plastic lenses of the same power. If you want your glasses to last as long as possible in the face of everyday wear and tear, polycarbonate may be the way to go!

Whether you wear them for fashion or outdoor protection, most of us likely have at least one pair of sunglasses. The fact that they're such a staple in iconic movie looks only adds to their cool factor.

However, did you know that sunglasses are divided into polarized and non-polarized lenses?

Both options are great in their ways, and fully understanding what they are can do more for you than you might realize.

Here's all you need to know about polarized and non-polarized sunglasses.

What are polarized sunglasses?

Polarized sunglasses reduce reflected light and glare. Source: Vision Center

Polarized sunglasses are best worn on bright sunny days. The reason is that they have lenses that reduce reflected light and glare. They're made out of a thin chemical film that filters some of the light that's reflected off glass, snow, and water.

Also known as anti-glare sunglasses, they're very similar to anti-reflective glasses and best used for the following situations and activities:

• Daytime driving on the highway or asphalt
• Fishing and boating
• Skiing and other winter sports
• Golfing

How do polarized sunglasses work?

A unique chemical filter on polarized glasses prevents some light from passing through the lens. With this filter, the lenses can disperse light so that not all of it's reflected into the eye.

When sunlight hits a flat surface such as glass, snow, or water, it's reflected at a horizontal angle to the eye which causes eyestrain. In polarized sunglasses, their coating blocks out horizontal light while letting vertical light pass through the lenses. Since the glare is reduced, you can see images and objects a lot clearer.

Differences between polarized and non-polarized sunglasses

Polarized lenses are better for filtering out a bright light that reflects off smooth surfaces. Source: Visionary Eye Care

Both polarized and non-polarized sunglasses are great for protecting your eyes from harsh light.

However, both of them protect your eyes in entirely different ways. Non-polarized lenses treat all light equally, which lowers the overall intensity of light. In some environments that have glass, snow, or water, you may still get a good amount of glare.

On the other hand, polarized lenses are more specific in that they filter out a bright light that reflects off of smooth surfaces.

With all that being said, either type of sunglasses is still good to have when you're out on a sunny day. To ensure maximum UV protection, always look for a pair that blocks 99% or 100% of UV light.

The benefits of polarized sunglasses

Due to their specific benefits, polarized sunglasses are best for those with an active lifestyle who require an extra layer of eye protection. If any of the following is a part of your every day, polarized sunglasses may be for you:

• Long hours spent outdoors
• Long-distance driving during the day
• Working or living in bright, sunny surroundings
• Constantly near or above water

Although polarized sunglasses are pricier than their non-polarized counterparts, they can be a worthwhile investment for a clearer field of vision and extra safety.

The benefits of non-polarized sunglasses

There are also some situations in which non-polarized sunglasses trump polarized ones. If your lifestyle comprises any of the following, opt for non-polarized lenses instead:

• Downhill skiing
• Operating of heavy machinery
• Flying

Wearing polarized sunglasses under the above circumstances will give you a harder time looking at certain screens or detecting important changes in color. For instance, most screens have polarized filters on them which helps you see them during the daytime. Wearing polarized sunglasses will cancel that filter out. In turn, this may compromise your safety.

Additionally, non-polarized lenses are a lot cheaper than their polarized counterparts. They also come in more hues, finishes, and colors, making them ideal for those seeking a certain aesthetic. If you don't want to keep swapping between sunglasses and eyeglasses, you can even opt for transitional lenses, which are usually non-polarized.

Moreover, non-polarized sunglasses are more accessible as you can usually find them in almost any optical store.

How to tell if your sunglasses are polarized

A quick self-check is needed to verify whether your sunglasses are polarized or not, even if they're labeled as such. Source: Framesbuy

There's no physical difference between polarized and non-polarized sunglasses. As such, it's essential to test out whether the lenses are polarized or not before you buy.

Luckily, there's a relatively quick method to check. While wearing the sunglasses, tilt your head to the left and right (at a 90-degree angle), while staring into an LCD or LED screen such as a computer monitor or smartphone. When you tilt your head back and forth while looking at the monitor, it should alternate between looking brighter and darker. This is how you'll know whether your sunglasses are polarized or otherwise.

For peace of mind, be sure to run this simple test even if your sunglasses are labeled as 'polarized'.

How to choose between polarized and non-polarized sunglasses

Both protect your eyes to a certain degree, but polarized lenses are a lot better if you're always exposed to harsh sunlight. Polarized sunglasses also enhance colors, clarity, and contrast.

If you're not seeking any of those features or don't have a lifestyle that needs polarized sunglasses, you're better off sticking to non-polarized sunglasses.

Non-polarized lenses are better for reading digital screens or displays, which makes them a common option among pilots. The reason for this is that the majority of LCDs, including your smartphone and tablet, utilize a polarizing filter to improve screen visibility in direct sunlight. However, polarized sunglasses have the same effect, so the two essentially cancel one another out, making your LCD screens appear dim or completely black.

Polarized or not, it depends!

Let's wrap things up!

Polarized and non-polarized sunglasses are generally great for protecting your eyes. But, polarized sunglasses take your visual experience to a whole other level by protecting against glare.

This doesn't make non-polarized any less of a viable option. They're still great for viewing digital screens or even when you're driving in low-light situations.

For more eyewear fun facts and trivia, keep it locked here on Door2USA Prescription Glasses!

If you're having trouble reading the text on your screen or distinguishing signs on the road, then perhaps you could use some assistance from single vision lenses.

Read on to learn more about single vision lenses, and find out which lens type you'll benefit from the most.

What are single vision lenses?

In a nutshell, single vision lenses are a type of lens that provides optical correction for a single distance. There are several kinds of single vision lenses that you can use, depending on the eye concern that you have.

For example, if you're having difficulty reading something up close, your doctor can prescribe you reading glasses to help you see close-up images or text better.

Similarly, if you have problems focusing on faraway objects, some distance glasses will be able to help you see them clearly.

What refractive errors can single vision lenses correct?

To better understand how single vision lenses work, it's helpful to understand the different types of refractive errors out there. They can be something that a person is born with or something that develops as they age.

As the most common type of vision problem there is, a refractive error is caused by a difference in the shape of the eye, which makes it hard for the retina to focus light correctly.

Below are the different types of refractive errors that single vision lenses can fix:

• MyopiaAlso called nearsightedness, myopia occurs when the eyeball is too long from the front to the back, which makes the light focus in front of the retina instead of on it. This makes distant objects appear blurry, while those nearby appear in focus. Differences in the shape of the cornea can also cause nearsightedness, which may be hereditary or developed depending on one's lifestyle.
• HyperopiaThis refractive error is the opposite of myopia and is often referred to as farsightedness. Unlike myopia, hyperopia occurs when the eyeball is too short from the front to the back, making the light focus behind the retina, instead of on it. People with hyperopia or farsightedness are usually born with this refractive error, but in many cases, hyperopia in children improves as the eyeball lengthens with development.
• AstigmatismAstigmatism occurs when the cornea has a slightly different shape, making the light bend differently as it enters the eye, therefore causing both faraway and nearby objects to appear blurry or distorted. Those with astigmatism are either born with the refractive error or develop it during childhood or young adulthood.

By manipulating the way light enters the eye, single vision lenses allow light to properly focus on the retina, helping those with refractive errors achieve the crystal-clear vision.

For someone with farsightedness, their prescription lenses will be thicker at the center, while those with nearsightedness will have lenses that are thicker around the edges. As for those with astigmatism, their eyeglasses will include a special cylindrical lens to make up for how light passes through the cornea.

Single vision lenses vs other types of lenses

Much like its name suggests, single vision lenses are catered for individuals who need correction mainly at one distance.

But, for those who need assistance seeing objects at varying distances, doctors may recommend bifocal, trifocal, or progressive lenses to help them see better as they do their day-to-day tasks. Here are the key distinctions that you need to know:

• Bifocal lensesThis type of lens contains two lens powers that allow you to see objects both near and far. Usually, the lower part of the bifocal lens has a prescription for reading, while the upper part of the lens has the necessary correction for distance vision.
• Trifocal lenses this type of lens has three distinct prescriptions in one lens, with the top portion containing the correction for distance vision, the middle portion for intermediate vision, and the lower portion for near vision.
• Progressive lensesThis type of lens contains multiple corrections that enable its wearer to see all ranges of vision clearly. What makes these lenses so special is that they offer a gradual shift in prescription, whereas trifocals have a clear distinction between the three fields of vision.

How do I know if I need single vision glasses?

If you have never needed eyeglasses before, but suddenly start noticing your eyesight becoming less sharp than before, it may be a good sign to schedule an eye examination with your doctor.

Often acquired by years of close reading, non-stop scrolling on digital devices or other eye-straining activities, here are some common symptoms that may be an indication that you need glasses:

• Fuzzy or blurry vision.
• Headaches or eye fatigue after long hours of reading.
• Squinting at varying distances.
• Appearance of halos or glares around lit objects.
• Night blindness or inability to see well in poor light.

Not sure if you need glasses? Check out our article on signs you may need glasses.

How much do single vision lenses cost?

Depending on where you purchase them, a pair of single vision lenses can cost you around $100-$300, but other factors may affect the final cost of your eyeglasses, such as your prescription, any add-ons such as anti-reflective coating or blue light filtering, the frame material and brand of your glasses, and so on.

At Door2USA Prescription Glasses, we offer a huge range of single vision glasses – browse our collection today.

The different types of single vision lenses

Single vision lenses come in many different forms and materials. Here are 3 common types:

1. Polycarbonate

Polycarbonate lenses are durable and impact resistant and are more lightweight and scratch resistant compared to plastic lenses. They are an ideal option for children's glasses or for those who engage in sports, as well as individuals who are always out and about, since polycarbonate lenses also offer UV protection from the sun.

2. Trivex

Trivex lenses are a bit thicker than polycarbonate lenses, but are more lightweight and produce sharper peripheral vision compared to polycarbonate lenses. Both polycarbonate and trivex lenses offer similar impact resistance and UV protection, though trivex lenses are a bit less accessible compared to the former.

3. High index

These lenses are usually recommended to people with high prescriptions, as high index lenses are made from special material to keep them light. This is a great alternative to regular plastic lenses, which usually need to be much thicker to accommodate strong prescriptions. High index lenses present a slimmer, and more lightweight alternative.

Frequently asked questions

1. What are single vision lenses used for?

Single vision lenses are used to help people with farsightedness, nearsightedness, or astigmatism see clearer. This type of lens contains one correction that is distributed evenly across the entire lens' surface area, which will allow light to properly focus on the retina.

2. What is the difference between single vision and reading glasses?

Reading glasses are a type of single vision lens that many farsighted wearers use to help them see close-up images or texts better. Those who need the same correction for both eyes usually purchase reading glasses over the counter, however, those who require different corrections per eye will have to get a prescription from a doctor.

3. Can you wear single vision glasses all the time?

Of course! There is no reason why you can't wear your single vision glasses throughout the day, but some people prefer to only use them when they need to (e.g. when driving, watching a movie, playing sports, etc.)

4. Do single vision lenses correct astigmatism?

Yes. Since those with astigmatism have an irregularly shaped cornea, single vision glasses for astigmatism will include special cylindrical lenses to make up for how light passes through the cornea's asymmetric curvature, producing a sharper picture once worn.

Spheric or aspheric lenses?

How do they differ? And what do those terms refer to anyway?

Well – let's start with the basics.

'Spheric' and 'aspheric' refer to the shape of the lens. A spherical lens has a curved surface in all directions, in the same way, a basketball does. Aspheric lenses, however, are curved in only some directions and are flatter near the edges. This results in thinner and lighter lenses – great news for anyone with a high prescription who doesn't want to deal with thick or bulky lenses.

Today, we're explaining what these two types of lenses are and why we recommend aspheric lenses here at Door2USA Prescription Glasses.

Spheric vs. aspheric lenses – the differences

What makes spherical and aspheric lenses so different?

What are spherical lenses?

Spheric lenses are a common type of lens with a simple curved design.

The 'spherical' refers to the fact that the shape of the lens has a singular curvature on both its rear and front profiles – kind of like a magnifying glass.

Spherical lenses tend to be thicker and will have a more prominent curve, especially as the prescription increases. They're sometimes referred to as 'big belly' lenses – since they tend to be bulkier.

This means that if you need a strong prescription, spheric glasses may not be ideal. The magnification can get quite obvious and give the wearer a warped 'bug eyed' look that's not very aesthetically pleasing.

The plus side? Spherical lenses tend to be cheaper because the manufacturing process is more straightforward.

What are aspheric lenses?

In literal terms – aspheric means 'not spherical'.

That's because aspheric (or aspherical) lenses use an irregular curvature on their front profile – with different radii of curvature for different points on their surface.

This results in a slimmer and flatter surface – especially at the edges of the lens.

If you have a strong prescription, high index aspheric lenses can help accommodate this whilst letting you wear slim and aesthetically pleasing lenses.

But it's not all about aesthetics – aspheric lenses tend to offer more precise light guidance. Whilst spherical lenses can create mild distortions, the shape of an aspheric lens can help objects look more natural and reduce aberrations or image errors.

What are double aspheric lenses?

Double-aspheric lenses take things one step further!

These lenses are irregular in curvature in both the front and rear surfaces of the lens. The result is a thinner profile that's both even more lightweight and aesthetically pleasing.

Pros and cons of aspheric lenses

Aspheric lenses have both strengths and weaknesses. Let's have a look at each.

Pros of aspheric lenses

• They're ideal for high prescriptions as an alternative to thick and bulky lenses.
• Their slimmer profile gives your eyes a more proportionate and natural look.
• The flatter lens edges look more aesthetically pleasing in your frames. They are lighter and more comfortable for daily wear.
• They offer superior optical performance compared to spheric lenses.

Cons of aspheric lenses

• They can give an increased reflection off its surface, so you'll want to make sure there's an anti-reflective coating on the lens (we add this coating to all Door2USA Prescription Glasses aspheric lenses).
• They can have a bit of distortion on the peripheral area of the lens.
• Aspheric lenses have a lower Abbe number which increases color distortion around the object that the wearer is seeing. The extent of this often depends on the wearer.
• Because of their more complicated manufacturing process, aspheric lenses can be more expensive.

When should you use aspheric lenses?

Your eye doctor can help you understand what lenses are right for you.

When should you consider using aspheric lenses, rather than spheric ones?

In our opinion – aspheric lenses simply offer a better visual experience for the wearer – with fewer aberrations and less distortion. Their lightweight nature makes them great for any pair of glasses that you plan to use regularly.

However, it's glasses wearers who have higher prescriptions who will really feel the difference.

If you need a strong prescription, aspherical lenses are the way to go if you want to keep your lenses flat and sleek.

However, if you only have very mild myopia, you can get away with either type of lens. If you're on a smaller budget, spherical lenses may be the way forward.

However, it would be best if you discussed all possible options with your eye doctor before deciding whether aspheric lenses work best for you.

Can I use high-index aspheric lenses?

Both 'high-index' and 'aspheric' lenses have similar goals – thinner lenses for higher prescriptions.

Lens index refers to how efficiently the lens material can bend light. The higher the index, the more effectively that lens can bend light (check our guide on lens indexes for more detail).

It can be helpful to remember that these terms refer to two different aspects of a lens:

• Lens indexRelates to the lens material and how easily it can bend light.
• Aspheric lensRelates to the shape of the lens.

Aspheric lenses can come in a range of indexes. High-index aspheric lenses are a fantastic double-whammy solution for people who require strong prescription lenses.

Wrap up: Aspheric lenses are our pick

At Door2USA Prescription Glasses – all our glasses come with aspheric lenses.

When shopping for new glasses, keep an eye out for the type of lens technology that's being offered. Some eyewear shops carry only spherical lenses, whilst some may offer aspherical lenses – or both.

Here at Door2USA Prescription Glasses, we've opted to use aspheric lenses in all our glasses. We're strong believers in the sleek and light design over the bulkier spherical equivalents – but also love the superior optical clarity.

Be sure to check out our full collection of stylish but functional frames!

We love to talk about frames, colors, styles, and aesthetics over here but let's not underestimate the importance of what those frames hold.

Yep, we're talking about lenses! Specifically, the battle between two materials, Trivex, and polycarbonate. These two lens materials both have their pros and cons, so let's do a deep dive to figure out which is best for you.

What is Trivex?

Trivex is relatively young, introduced to the optical world in around 2001 by PPG Industries. Before that, it was created for the military (so you know it is tough!). Trivex was brought into the commercial optical industry because it has three key qualities: it's extremely strong and durable, it's very lightweight, and it allows for fantastical optical ability.

So, what's it made of? It's a urethane-based pre-polymer (sorry… what?), a light, low-density type of plastic.

Okay, before we go any further, we need to discuss something called the 'Abbe value'. This rating system is used to measure the optical clarity of a lens.

Trivex has slightly better Abbe value than polycarbonate, at 43-45, meaning it offers better optical clarity. A low Abbe value can mean that the lenses will present more chromatic aberration, a fuzzy or colored edge. However, you usually only experience chromatic aberration when looking through the very edges of your glasses as opposed to straight through the middle as usual.

What is polycarbonate?

Like Trivex, polycarbonate has a pretty badass origin story. While the material was discovered in the late 1800s, it was further developed in the 1960s to be used for visors and helmets for astronauts. In the late 70s, it was being used for commercial eyeglass lenses because of its superior strength and durability. Because polycarbonate is so durable and impact-resistant, it's a popular material for safety eyewear and eyewear for kids.

This strong type of plastic is a popular choice for people with a moderately high prescription as they can support the prescription without being thick and heavy. This is one of the areas where polycarbonate edges out over Trivex.

Speaking of polycarbonate versus Trivex, let's put them head to head.

Differences between Trivex vs polycarbonate lenses

Polycarbonate and Trivex are quite similar, but there are some differences to take into account. They're siblings, not twins, in other words.

1. Thickness and weight

One of the main differences between the two materials is thickness and weight. Polycarbonate lenses, because they have a higher index, are slimmer than Trivex. The higher index means they're better at supporting a higher prescription.

Funnily enough, Trivex is slightly lighter than polycarbonate because it is made of lighter stuff.

2. Lens index

As mentioned before, lens index refers to how well the lens can refract light. The higher the index, the better it can refract light, and the thinner the lens is. Back in the day, a strong prescription was a sentence to a pair of thick lenses that sat heavily on the face. Thanks to smart people and better tech, you can now have a mega strong prescription but still enjoy thin, light lenses with a high index.

Trivex has a lower index than polycarbonate, so is better for weaker prescriptions. Polycarbonate lenses can be a good option for stronger prescriptions.

3. Impact resistance

Impact resistance is an important factor, especially for very active or sporty people who need to keep their glasses on when thrashing around a field or hectic workplace.

The good news is that both Trivex and Polycarbonate offer fantastic impact resistance. Both are equally hardy, durable, and scratch-resistant. Both are much harder than your standard CR39 plastic lenses.

Durable lenses are best for keeping up with an active lifestyle.

4. Tensile strength

Another strength-related factor is the 'tensile' strength, relating to how strong a material is when subjected to tension. In terms of lenses, this refers to how the material holds up when drilled and manipulated into a frame or particular style.

Trivex is slightly better in terms of tensile strength, which makes it great for rimless glasses that require screws to be drilled directly into the lens. Polycarbonate, while still a very strong material, is best suited to styles that don't require drilling (such as full and semi-frames).

5. UV protection

We can't compare lens materials without discussing UV protection. These guys come out pretty equal in the UV protection department. Both polycarbonate and Trivex lenses naturally block UV rays from accessing the eyes.

6. Optical clarity (Abbe value)

What's the point of lenses? To make us see better, which brings us back to the Abbe value, the rating system for optical clarity. Polycarbonate has an Abbe value of 30, while Trivex has a value of 43-45. This means that Trivex offers better optical clarity than polycarbonate. However, polycarbonate lenses still offer great performance, especially if you have a weaker prescription.

7. Cost

And finally, the cash. Yep, the cost is a factor we all need to take into account to some degree. Trivex is more expensive than polycarbonate, making the latter a perfect choice for smaller budgets.

	Polycarbonate	Trivex
Pros	Thinner than Trivex Super durable and impact resistant Flexible Excellent for strong prescriptions Affordable	Lightweight Strong/durable Superior optical clarity Great Abbe value
Cons	Inferior Abbe value (to Trivex)	Slightly too thick for very strong prescriptions More expensive

Should you use Trivex or polycarbonate lenses?

No matter which you choose, you're picking a darn smart lens material, especially when choosing at Door2USA Prescription Glasses! However, some factors may shift the compass toward one or the other depending on your needs.

Polycarbonate is a fantastic choice if your life is busy, active, and a little rambunctious. They are stronger than anything, have excellent UV protective abilities, and are nice and slim to fit neatly into any frames, even delicate ones.

Our polycarbonate lenses have an index of 1.59, slightly better than Trivex at 1.53. This means they refract the light more effectively, making them better for slightly stronger prescriptions. Our polycarbonate lenses offer blue light blocking tech (if you wish to add it to your lens) that protects your eyes from all that screen time throughout the day.

However, if you have a lower prescription or wear your glasses on and off, Trivex is a fine choice. It's durable and withstands being popped in and out of a case all day. Our Trivex lenses only come in clear form as opposed to blue-blocking, so they're great if you're using them for driving, reading (real paper books that is), or for shorter periods.

Frames recommended for polycarbonate lenses

The great news is that polycarbonate lenses are great for most frames! They can fit nicely into full frames but can also be a good option for semi-rimless frames.

For rimless frames, you might want to pick a Trivex lens just for that extra level of tensile strength. Our favorite frames for polycarbonate lenses here at Door2USA Prescription Glasses are:

The Cherish with transparent frame.

The Cherish frames feature a sturdy acetate frame in the sweetest pale lilac or yellow shades. These frames support a polycarbonate lens beautifully and can be fitted with a simple polycarbonate lens or a blue-light coated one (prescription or non-prescription).

The Artist with a tortoise-browline combo.

The Artist frames are excellent paired with polycarbonate lenses as their thin construction can fit neatly within the delicate metal frame. However, the full frame nature means the lenses aren't at any risk of fracturing due to screws (as with rimless styles).

You can opt for a simple polycarbonate lens, a blue light blocking coating (Crizal Prevencia), or an extra durable smudge-resistant coating (Crizal Sapphire).

Other highly recommended frames also include Lulu, Vow, and Neat NT008 (a premium pick):

The Lulu is with a tortoise frame. The Vow with a cat eye frame. The flat-top NEAT NT008.

Get stylish Trivex and polycarbonate options at Door2USA Prescription Glasses!

Here at Door2USA Prescription Glasses, we champion polycarbonate and Trivex lenses. We're particularly smitten with our polycarbonate lenses because they're just so darn impact-resistant (we're a little clumsy over here) and affordable.

You can get your polycarbonate lenses for distance, reading, or non-prescription glasses and can even get a powerful blue light blocking coating added.

To make sure you've picked the very best pair for you, use our trusty virtual try-on tool to check yourself out in your frames before you commit to them.

Hydrophobic coatings on lenses have been around for a long time now.

And thank goodness! They help you avoid the problems caused by wet lenses, and help keep your glasses cleaner for longer.

If you've ever worn glasses, you know that they can become completely useless when they get wet. If you're out in the rain or someone spills something on your face, it can be a distracting annoyance if you don't have a microfibre cloth handy.

And while some people may think this is funny or cute when it happens to other people's glasses, it can be frustrating when it happens to yours!

What does the term 'hydrophobic' mean?

Hydrophobic is a term from the Greek words 'hydro,' meaning water, and 'phone,' meaning fear. So it means fear of water.

Why would something be afraid of water? It's not just because they don't like to swim or take baths. The term hydrophobic is also used to describe substances that repel water molecules. So if you have something hydrophobic, it means that it repels water molecules and doesn't absorb them into their structure.

How does a hydrophobic coating work?

When you think about the way water interacts with things, it's pretty simple. It just gets wet and stays wet. The only time it changes state is when it freezes or boils. When that happens, the water molecules form crystals or bubbles on the surface of the object they're touching.

And that's why hydrophobic coatings are so effective—they keep water droplets from sticking to their surface by making them bead up and roll off rather than wetting down the surface. Another type of hydrophobic coating is the super hydrophobic coating which, not only will water bead up and roll off any surface but it will also be repelled by air.

But there are times when hydrophobic coating doesn't work on a material, and there are two possible causes: either the application process wasn't done correctly or the material being coated isn't meant to be treated that way. This leaves the material prone to staying wet, which is not what you're looking for.

So when purchasing any eyewear or lenses, make sure to check if there's a hydrophobic coating. Luckily, all Door2USA Prescription Glasses lenses have hydrophobic coatings by default!

Benefits of hydrophobic coating for glasses

Now that we've covered the basics, let's explore some of the many advantages hydrophobic coatings offer:

• A hydrophobic coating on glasses makes the surface water-repellent. So, when rain hits a hydrophobic lens it repels droplets and prevents moisture build up on the lens. This is great for people who sweat or go out on rainy days and don't want their glasses to get foggy.
• Hydrophobic coatings on glasses also help prevent dust particles from clinging to the lenses. They simply fall off when they come into contact with the lens.
• It reduces the visual distortion caused by water or rain on glasses and sunglasses. It can also help resist stains and repels grease and fingerprints, so cleaning your lenses is quicker — and easier!
• If your glasses fog up, it can be extremely annoying. A hydrophobic coating on your glasses will keep moisture from adhering to the lenses—so they won't form condensation when you're outside in extreme temperatures or humidity.
• Parents who wear glasses struggle when bathing their children who tend to splash about in the tub. Even cleaning your car is a struggle when wearing glasses. We face a lot of everyday struggles when it comes to wearing glasses and having hydrophobic lenses help make it easier to manage these tasks.

How to take care of hydrophobic lens coatings

It's important to clean your lenses regularly.

It's important to take proper care of these coatings so that they continue to work as well as they did when you first got them. Here are some ways on how to take care of your lenses:

• Lather your hands with soap and wash them with warm water before touching the lenses.
• Use a clean lens cloth or microfiber cloth to clean your lenses with a drop of cleaning solution. Make sure that the cleaning solution or solution that comes with your lens cloth is compatible with the type of coating on your lenses.
• Rinse off any residue from the cleaning process with tap water, or if you're using a cleaning solution, rinse it off with tap water.
• Dry your lenses with a clean lens cloth or microfiber cloth.
• When not in use, store your glasses in a protective case or, if you don't have a case, wrap them in a microfiber cloth.

For more details, check our guide on how to care for your glasses properly.

Final thoughts on hydrophobic lens coatings

Hydrophobic coatings on lenses are a vital piece of technology that is constantly evolving. They are applied in a wide variety of materials, from eyeglasses to camera lenses to mirrors.

The reason for this is simple: they help prevent water and other liquids from damaging the surface of the lens, which can lead to fogging, smearing, and other issues that can be incredibly frustrating when you keep taking your glasses off and cleaning off the dirt and smudges.

Hydrophobic coatings aren't perfect — they can wear off over time or get damaged by chemicals or scratches – but if you look after your glasses well, you can prolong their effectiveness.

Want hydrophobic-coated glasses of your own? Check out any of our frames in our eyeglasses collection – Door2USA Prescription Glasses' styles not only look great but are functional as well with all lenses coated in hydrophobic coatings!