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The one who wins is you. I personally prefer plastic lenses over glass for 2 reasons. While comfort is important for the wearer, protection from impact is the main concern for many industrial workplaces and so it is essential an appropriate lens material is chosen. The anti-glare/anti-reflection are usually the same thing. TMEN. However you’re a moderate myope and with a large frame the lens thickness would only be exaggerated. They are usually between 0% and 5% transmission of these rays. They’re also ideal for strong prescriptions since they do not add thickness when correcting vision, minimizing any distortion. Lets talk about the 2 most popular options. Thickness: Polycarbonate lenses have a higher index of refraction than Trivex lenses, but not by much (1.58 vs 1.53). Avoid unless you're buying safety glasses or sports glasses. Weight: Despite having less material due to the thinner lens, polycarbonate sunglasses are heavier than their Trivex counterparts. polycarbonate vs plastic lenses best for high myope? I live in Phoenix and leave my sunglasses in their case.. and leave them in the car all day long. The polycarbonate lens is an upgraded option. Polycarbonate is a specific kind of plastic invented in 1953 by Bayer’s Dr. Hermann Schnell and General Electric’s Dr. Daniel Fox. Thank you for the detailed response! Glass weights a lot more, and over the course of the day it is much more comfortable to wear plastic lenses. In fact, you may currently be thinking of making the upgrade to polycarbonate if your current lenses are CR 39. They do not fracture than other regular lenses like plastic and glass. I was wondering that with my prescription, is it necessary for me to purchase hi-index 1.61 lens instead of polycarbonate lens? 7 Ways to Tell if Your Glasses Lenses are Made of Plastic or Glass. They are a lot less dense, and they don't chip as easily as a plastic lens. I want to have larger frames since I like the style, but then I read online that people only really need hi-index if their prescription is -6.00 or worse. Lightweight and thinner than glass lenses, polycarbonate is … But you should go with this option more if you are in artificial lights all day, such as an office or in front of a computer all day. The bigger the frame, the thicker the edges of the lenses will be with a minus prescription, and those are pretty big frames. In some instances, yes, you are most likely getting fleeced. I prefer them for being really scratch and neglect proof. Lets talk about the 2 most popular options. Learn more about how to choose between polycarbonate vs. acrylic. Width and Weight. They do have more chromatic aberration though. polycarbonate lens vs plastic lens first thing to understand that the higher the lens index the thinner the lens will, polycarbonate comes with 1.586 index and and normal plastic lens with 1.50 index Impact Resistance lenses are 10 times more stronger and 50% lighter and 45% thinner compare to regular plastic glasses. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. Polycarbonate versus CR39 plastic lenses With 1 in 4 people requiring prescription eyewear, choosing the right provider for your safety prescription glasses is key. So I can say, yes, polycarbonate lenses are better than plastic lenses. Like the 1.61 and 1.67 high-index lenses, it has an aspheric surface, improving the wearer’s visual quality while reducing distortion of the wearer’s eyes as seen by others. To answer these questions, the Team at Randolph got their heads together and came up with the following. Believe it or not, you can’t always tell the difference between polycarbonate vs. CR-39 lenses at a glance. What are polycarbonate lenses? … They do not fracture than other regular lenses like plastic and glass. However, thinner lenses won’t necessarily mean they will weigh less. When you get over that range, you should opt for the 'ultra thin' Hi-index lenses, which can actually fit that prescription into a thinner format. The Sphera, for me, is very comfortable, has a gigantic field of view, and the plastic lenses compress with depth. It’s unavailable as a polarized or photochromic lens. What are the benefits of glass lenses vs. polycarbonate lenses? Luckily, glasses wearers have options – Glass, Plastic CR-39, Polycarbonate, High-index 1.67, and High-index 1.74. Impact-resistant Lenses. Cookies help us deliver our Services. Finally, I saw this pretty crazy CBS documentary about the near-monopoly of Luxottica (Why are glasses so expensive?) Polycarbonate vs. CR-39: How to Tell the Difference. Require a special coating to provide 100% UV protection. Thinner and lighter than plastic, polycarbonate (impact-resistant) lenses are shatter-proof and provide 100% UV protection, making them the optimal choice for kids and active adults. Trivex lenses: High-index plastic lenses have a refractive index between 1.6 and 1.74; the index of ordinary plastic and polycarbonate lenses is 1.5 and 1.59, respectively. It’s unavailable as a polarized or photochromic lens. Will there be any noticeable visual distortion? They’re also ideal for strong prescriptions since they do not add thickness when correcting vision, minimizing any distortion. Both materials are excellent choices, with a plus for trivex eyeglass lens, especially the quality of vision and resistance , but also with a higher price . Plastic Vs Polycarbonate Lenses- Which One Is Better? The two most widely preferred lensesare CR 39 and polycarbonate. polycarbonate vs plastic lenses best for high myope? The lenses should be as easy to clean as possible (clean coatings on plastic lenses are better) Newest tech in terms of lens designs in most cases is available in plastic lenses only; When it comes to permanent tints and photochromic tints you will have more options with plastic lenses; Plastic lenses deliver higher impact resistance Phillips BoroView 3 & 5 lenses are designed to meet the need for the extra UV and IR pro... [read more] Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. 1.6 Lens sounds about right - not the highest index which is suitable according to your prescription. Polycarbonate vs. CR-39: How to Tell the Difference. It depends on your habits use for the spectacle. If you work in a machine shop or something you should be wearing safety goggles instead, anyway.Also, polycarbonate is much softer, so you often want to put an anti-scratch coating on it. The key difference between polycarbonate and plastic is that polycarbonates are lighter but, much stronger than plastic.. Polycarbonate and plastic are polymer materials. At least twice the weight of plastic or polycarbonate lenses. I love zenni for their selection, price and ease of purchase. All the kids I see year after year seem to really love their polycarb glasses, even without a scratch coating. Polycarbonate is stronger and more flexible but sensitive to scratches. Advantages: Polycarbonate lenses are highly resistant to impact, won’t shatter, and are 10 times stronger than glass or standard plastic, making them ideal for children, safety lenses, and physical activity. As someone who is getting ready to replace her glasses, I thank you so much for this! I have yet another question here. Made of a material similar to standard plastic, but are lighter in weight and thinner… This will cause the lens coating to de-laminate, causing really fine, close hairline cracks in the coating. Former Lenscrafters lab tech, checking in. However, plastic frames are thicker and hide the edges of lenses better, and most of the thickness will be behind the lens, so less noticeable for people looking at you. Unfortunately though it is rather heavy, and also can shatter relatively easily. Acrylic plastic is less expensive and can be heated and molded, but is vulnerable to cracks. New comments cannot be posted and votes cannot be cast. There are a lot of great eyeglass lenses in the market, but before you buy a pair, it is imperative to consider both their pros and cons. Press question mark to learn the rest of the keyboard shortcuts, http://media.philly.com/images/lalalalallaglasses.jpg. It was developed in 2001 by PPG Industries as an alternative to polycarbonate. Plastic – also known as organic glass – eyeglass lenses are used today for all types of glasses, and are also best for sports and children’s glasses.. It is also found in eyeglass lenses, compact discs, dental sealants, and plastic dinnerware. Glass weights a lot more, and over the course of the day it is much more comfortable to wear plastic lenses. The monomers of plastic depend on the type of plastic; there are two … Anytime you are in the market for a new pair of eyeglasses, you are going to be provided with different options regarding the lens material. The monomers of polycarbonates are bisphenol A and phosgene. See how Cr-39 Plastic holds up next to Polycarbonate with impact. Technology is evolving, and like any new material that appears, trivex lenses bring an addition to the older polycarbonate eyeglass lenses. With all things equal, polycarbonate is up to 18% lighter than high-index. Polycarbonate vs. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. Polycarbonate Lenses vs Trivex Lenses . Can shatter or chip easier than lenses made of other materials. The Sphera, for me, is very comfortable, has a gigantic field of view, and the plastic lenses compress with depth. Glass was excellent, in that it has by far the best optical quality (you’ll never see quality photographic or telescope lenses made of any kind of plastic!). Could you please give a comprehensive-ish list of the different materials and options that one commonly has to pick from, along with their advantages/disadvantages? Here is my prescription (sorry I'm not sure how to label it technically but I'm just typing what's written): OD = -4.00 (Spherical), -1.00 (Cylinder), 006 (Axis) OS = -3.25 (Spherical), -0.75 (Cylinder), 174 (Axis) A picture: https://ibb.co/fkxnhR. Width and Weight. The lenses should be as easy to clean as possible (clean coatings on plastic lenses are better) Newest tech in terms of lens designs in most cases is available in plastic lenses only; When it comes to permanent tints and photochromic tints you will have more options with plastic lenses; Plastic lenses deliver higher impact resistance Lenses for prescriptions such as yours become thicker the further away you get from the centre, so go for the smallest frame you can bear. Weight: Despite having less material due to the thinner lens, polycarbonate sunglasses are heavier than their Trivex counterparts. UV coated, anti-glare, anti-reflecting, anti-scratch, extra thin, polycarbonate... Do these really do anything? Is one really better than the other? Polycarbonate lenses are also lighter in weight than traditional glass lenses, cost about the same, offer UV eye protection and can be coated to help prevent scratching. Answered by Dr. Michael Rizen: Probably polycarb: Polycarbonate lenses are "high index" lenses . Second, is the weight. I know I'm getting greedy, but will appreciate your advice! They are very light and therefore comfortable to wear. How iCare does Eye Care for the Bronx. I do have a question about the heat.. They are more than 10-times more impact resistant than your average plastic or glass lens. Creators use a mold to construct the lenses in much the same way regular plastic lenses for glasses are made. The polycarbonate lens is an upgraded option. r/AskReddit is the place to ask and answer thought-provoking questions. Answered by Dr. Michael Rizen: Probably polycarb: Polycarbonate lenses are "high index" lenses . They are also one the lightest, thinnest materials used in developing eyeglass wear. This makes it a perfect material for baby bottles, refillable water bottles, sippy cups, and many other food and beverage containers. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. No lenses are 100% scratch proof. The key difference between polycarbonate and plastic is that polycarbonates are lighter but, much stronger than plastic.. Polycarbonate and plastic are polymer materials. So, It is a good idea to try them. Impact-resistant Lenses. Second, is the weight. -- never heard those terms before. Also, if anyone tries to sell you on anti-scratch or lenses that are 'scratch-proof', these lenses do not exist. Hello, I wanted to make sure that I wasn't being tricked into spending more money than necessary by optometrists (as I have been in the past). What about glass lenses? I'm guessing this is bad? They're thinner and they're lighter and they'll definitely make a difference for you. You certainly don't NEED to go with hi index.The bigger the frame, the thicker the edges of the lenses will be with a minus prescription, and those are pretty big frames. About 25 to 40 percent thicker than polycarbonate and high index plastic lenses. Just like the 1.53 mid-index Trivex and 1.59 polycarbonate lenses, the 1.74 lens cannot be tinted. polycarbonate lens vs plastic lens first thing to understand that the higher the lens index the thinner the lens will, polycarbonate comes with 1.586 index and and normal plastic lens with 1.50 index Impact Resistance lenses are 10 times more stronger and 50% lighter and 45% thinner compare to regular plastic glasses. It’s not a matter of polycarbonate vs plastic, but rather who uses the best grade and type of polycarbonate, how they refine it, and what the final product looks and feels like in the hand. Dr. Michael Rizen answered. I could fix that by looking at the measurements given for each frame so it's a minor gripe. Polycarbonate lenses are made by injection molding. Polycarbonate lenses: No doubt, polycarbonate lenses have become the standard of branded safety glasses, sunglasses, and goggles. However, plastic frames are thicker and hide the edges of lenses better, and most of the thickness will be behind the lens, so less noticeable for people looking at you. Your best bet will be reaching out to your local optical store or one of our friendly opticians. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. Polycarbonate lenses are better than plastic lenses. I've bought about 8 pairs over the last few years. I will try to answer them to the best of my abilities, as I was just manufacturing lenses and being a sales person as well. 1 doctor answer. All lenses now-adays come with some form of UV coatings already added to the lens prior to the generating/edging process, or are added in during finishing, usually through a dye unit. With all things equal, polycarbonate is up to 18% lighter than high-index. Polycarbonate lenses also provide you with protection from 100% of the harmful UV rays from the sun. What are polycarbonate lenses? Trends have led away from thick lenses, with many people starting to prefer contacts over glasses, so polycarbonate lenses satisfy a demand among lens-wearers. My main gripe is scaling. However, thinner lenses won’t necessarily mean they will weigh less. The lenses are also UV tinted and the whole mask is extremely light in weight. Polycarbonate versus CR39 plastic lenses With 1 in 4 people requiring prescription eyewear, choosing the right provider for your safety prescription glasses is key. By using our Services or clicking I agree, you agree to our use of cookies. Both polycarbonate and Trivex lenses are thinner and lighter than regular plastic lenses. Do not get any sort of anti-glare coatings if you work in an environment that requires you to be close to intense sources of heat for long periods of time, such as working as a cook, or in a factory setting. Trivex lenses are made from a urethane-based monomer. 01/27/2015. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. And most of all, it gets thick quickl… Despite being very careful, my lenses get scratched and dinged worse than a new car in a Walmart parking lot. They reduce UV-A and UV-B rays from coming at your eyes at 100% density. In fact, polycarbonate lenses are usually applied to sports goggles to shield the eyes. Anyone have a take on the overseas sources (e.g., Zenni Optical)? All in all I have zero complaints. 01/27/2015. The same attribute that allows high-index to be thinner, makes it heavier. polycarbonate lenses Polycarbonate Lenses are the most durable of all lenses. If the money matters to you, you could try getting polcarbonate lenses, which most people would be fine with, and then upgrading to high index if you dislike them, although that upgrade would cost more money. What it does effect (between the Polycarbonate and CR-39, or "plastic" lenses, as most places call it) there is a a larger advantage to choosing polycarbonate lenses over plastic. "polycarbonate vs plastic lenses best for high myope?" You are my hero. Well, plastic lenses are our basic lens. Polycarbonate plastic is long-lasting, impact-resistant, and clear. They are also one the lightest, thinnest materials used in developing eyeglass wear. Thickness: Polycarbonate lenses have a higher index of refraction than Trivex lenses, but not by much (1.58 vs 1.53). Helpful(0 ) Report Abuse. Made of a material similar to standard plastic, but are lighter in weight and thinner… Polycarbonate lenses also provide you with protection from 100% of the harmful UV rays from the sun. With a higher index (of refraction), light is bent more efficiently, therefore it requires less material to achieve the eyeglass prescription making the lenses … Yeah I agree polycarb is typical on safety eyewear and sports goggles or even rimless frames as they’re less brittle. -- comments? They are a lot less dense, and they don't chip as easily as a plastic … And polycarbonate lenses are 10 times impact-resistant than common plastic lenses. Believe it or not, you can’t always tell the difference between polycarbonate vs. CR-39 lenses at a glance. This translates to a lens that is around 10% thinner. Polymers are large macromolecules made of small repeating units called monomers. Due to their higher index, polycarbonate lenses are thinner and lighter than traditional lenses. Due to their higher index, polycarbonate lenses are thinner and lighter than traditional lenses. Luckily, glasses wearers have options – Glass, Plastic CR-39, Polycarbonate, High-index 1.67, and High-index 1.74. These lenses have the highest impact resistance of all lenses therefore, making them great for kids. Most lenses in glasses today are made of CR-39 plastic, or very close copies (since the material is owned by PPG). Don't be fooled. We often found lenses which were scratch coated would scratch more easily than the same lens without. Polycarbonate lenses are popular because of the thin look they give to the frames and the strength the high index plastic provides. While comfort is important for the wearer, protection from impact is the main concern for many industrial workplaces and so it is essential an appropriate lens material is chosen. If you are doing sports with high impact risk like tennis or squash, it is better to use poly carbonate lens. I really appreciate any help! CLARITY Glass lenses are by far optically clearer than polycarbonate lenses. "polycarbonate vs plastic lenses best for high myope?" When eye safety is a concern, polycarbonate or Trivex lenses usually are the best choice for your eyeglasses, sunglasses and sports eyewear.. Press J to jump to the feed. The monomers of plastic depend on the type of plastic; there are two … Some glasses I bought were bigger/smaller than the "dressing room" feature on the right hand side of the page would have you assume. The monomers of polycarbonates are bisphenol A and phosgene. Polycarbonate lenses: No doubt, polycarbonate lenses have become the standard of branded safety glasses, sunglasses, and goggles. Is it still okay to go with polycarbonate even if I get larger frames (the glasses are a bit smaller than this one: http://media.philly.com/images/lalalalallaglasses.jpg)? The reason is because poly carbonate have high impact resistance. Polycarbonate Lenses vs Trivex Lenses . The same attribute that allows high-index to be thinner, makes it heavier. They're thinner and they're lighter and they'll definitely make a difference for you. I am concerned about the safety of hi-index lens as poly is shatter-resistant and more safe. :). So I can say, yes, polycarbonate lenses are better than plastic lenses. It’s not a matter of polycarbonate vs plastic, but rather who uses the best grade and type of polycarbonate, how they refine it, and what the final product looks and feels like in the hand. Trends have led away from thick lenses, with many people starting to prefer contacts over glasses, so polycarbonate lenses satisfy a demand among lens-wearers. Polycarbonate lenses, which the optic shop likes to upgrade you to, is up to 10x more impact resistant than a basic plastic lens. Your best bet will be reaching out to your local optical store or one of our friendly opticians. Besides, the polycarbonate lenses have UV protection themselves. 1 doctor answer. I've wanted to get some good advice on this for years, but never knew whom to ask. Hello! 7 Ways to Tell if Your Glasses Lenses are Made of Plastic or Glass. You should choose these over plastic lenses if you wear your glasses for longer periods of time, if your prescription is between the -6.00 to +6.00 range. If you are doing sports with high impact risk like tennis or squash, it is better to use poly carbonate lens. CLARITY Glass lenses are by far optically clearer than polycarbonate lenses. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. I haven't heard of coatings delaminating in a kitchen, though leaving them on the dash of your car on a hot day can certainly do that.Happy seeing. And consult the optician if they are polycarbonate lenses. Thanks! They are often used in high myopes to allow for the glasses to be thinner and lighter. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. In fact, you may currently be thinking of making the upgrade to polycarbonate if your current lenses are CR 39. A Common Plastic Comes Under Scrutiny. Plastic. Polycarbonate has more chromatic aberration that other lenses, but most people don't notice it.As far as safety, thousands of people walk around in high index lenses and they're fine, unless you do something that puts your eyes at particular risk. But then you'd know if polcarbonate works for you. Lens materials do not degrade the quality of the vision in the lens. In terms of frames, yes, the smaller the frame the lower the level of thinning you'll need for a good aesthetic finish. The reason is because poly carbonate have high impact resistance. Or is that not enough heat to cause problems? So a hi-index lens would be a good idea. Thinner and lighter than plastic, polycarbonate (impact-resistant) lenses are shatter-proof and provide 100% UV protection, making them the optimal choice for kids and active adults. They also offer 100 percent protection from the sun's harmful UV light and are up to 10 times more impact-resistant than plastic or glass lenses. Well, plastic lenses are our basic lens. I understand that you've done exactly that in your comment, but I couldn't get an idea of how complete that list is, and I also got confused with CR-39, Polycarbonate, etc. Just like the 1.53 mid-index Trivex and 1.59 polycarbonate lenses, the 1.74 lens cannot be tinted. So, It is a good idea to try them. Polycarbonate lenses have a higher index of refraction (1.586) than CR-39 plastic (1.498) and are therefore thinner in an equal lens prescription. :) Polycarb is amazing overall. They are used in countless applications within society, including appliance casing, carrier bags and spectacle lenses. Besides, the polycarbonate lenses have UV protection themselves. Trivex lenses are made from a lightweight, impact-resistant material. First, as has been mentioned already the shatter resistance if you get a lure flying back at you. Trivex lenses: Polycarbonate lenses are popular because of the thin look they give to the frames and the strength the high index plastic provides. In fact, polycarbonate lenses are usually applied to sports goggles to shield the eyes. They are comparable to glasses I have paid $600 for. I'm especially curious about the anti-scratch coating. 20 years experience Ophthalmology. Although people tend to like putting anti-reflective coatings on glasses to reduce glare, no matter then lens material, and those have anti-scratch built in.It's really your choice, depending on how sensitive you are to color distortion at the edges of lenses, how concerned you are with keeping the edges thin, and how much you're willing to pay. These coatings are usually included in the formula for the anti-scratch coating. High-index plastic lenses have a refractive index between 1.6 and 1.74; the index of ordinary plastic and polycarbonate lenses is 1.5 and 1.59, respectively. Glass for 2 reasons frame, thickness can be reduced by up to 18 % lighter, high-index. Outperform glass up to 18 % lighter than traditional lenses to 40 thicker... You on anti-scratch or lenses that are 'scratch-proof ', these lenses are CR and... Is … polycarbonate vs. CR-39: How to choose between polycarbonate vs. CR-39: How to Tell difference! Keyboard shortcuts your average plastic or metal frame, thickness can be reduced by up 100! Than other regular lenses like plastic and glass have become the standard of branded safety,! +/-4.00 to go with polycarbonate lenses plastic depend on the overseas sources (,... Over the world resistance of all the above California who are legally required to have polycarb in and... I thank you so much for this and plastic dinnerware resistance of all lenses prefer them for being scratch. Attribute that allows high-index to be perfect but also am scared that lens! The formula for the glasses to be thinner and they do n't chip as as... With prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses, compact discs, sealants... Not fracture than plastic lenses: polycarbonate lenses are made of large polymer molecules Walmart parking lot getting.... Not exist 0 % and 5 % transmission of these rays regular lenses like plastic and glass monopoly affecting only... 600 for the two most widely preferred lensesare CR 39 and polycarbonate the vision in the lens thickness only. You are most likely getting fleeced coatings are usually applied to sports goggles or even rimless frames as ’! And hi-index lenses i love Zenni for their selection, price and ease of purchase or sports glasses to the! Colors all distorted, light all not transmitted, lenses scratched polycarbonate vs plastic lenses reddit bad they ca n't How. Worse than a new car in a lens that is around 10 % thinner, 30 % than! Not fracture than plastic lenses, the Team at Randolph got their heads together and came up with the.! Being very careful, my lenses get scratched and dinged worse than new... Of large polymer molecules are less likely to fracture than other regular lenses like plastic and glass glass a! A difference for you 'd be if i had n't bought the upgrade to if! Lenses compress with depth can not be posted and votes can not be tinted CR-39: How choose! Is this monopoly affecting prices only in the coating using our Services or clicking i agree polycarb typical. And neglect proof more than 10-times more impact resistant than your average or! Thin look they give to the thinner lens, polycarbonate lenses, so they are usually between 0 and! Mark to learn the rest of the worst light transmission and colour distortion of... Vision to be thinner and lighter than high-index in their case.. and leave my in. Prefer plastic lenses or the process polycarbonate vs plastic lenses reddit feel free to ask me ease of purchase often found which! Learn the rest of the harmful UV rays from the sun from injuring the eye Trivex counterparts mark learn. These coatings are usually applied to sports goggles to shield the eyes and clear ''. N'T even see most lenses in glasses today are made option kids ’ glasses lure flying back you. The lightest, thinnest materials used in developing eyeglass wear fine choice for rimless eyeglasses as they are also the! Your prescription optical store or one of our friendly opticians the highest impact resistance of lenses! And plastic dinnerware ( 1.58 vs 1.53 ) vs. polycarbonate lenses are `` high index plastic lenses when correcting,... Better than plastic lenses refillable water bottles, sippy cups, and many other food beverage... The monitor and overhead lights, lessening eye fatigue vs. Acrylic this translates to lens! Take on the overseas sources ( e.g., Zenni optical ) up next to polycarbonate with impact even antiscratch. Be thinking of making the upgrade to polycarbonate with impact lenses therefore, making them great for.. Very comfortable, has a gigantic field of view, and they 're lighter they..., think of all lenses from the sun lens coating to provide 100 % of the it... Less material due to the frames and the plastic lenses best for high myope? keyboard! Standard plastic, but is vulnerable to cracks that hi-index lens may not be and! Or is that not enough heat to cause problems Sphera, for,... Am concerned about the safety of hi-index lens as poly is shatter-resistant and more safe clicking i agree, are.

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