The monomers of plastic depend on the type of plastic; there are two … Lens index is a number that describes how thick or thin your lenses are. If you are doing a hi index look for a Crizal lens coating, its supposed to be good and I believe it comes with a lifetime scratch warranty. For my money that would be the best you could get. If you chose a frame that mounts by drilling holes through the lens, you need to make sure you use a material that is not too brittle. 1.74 High Index Lenses are on average 50% thinner than ordinary CR39 plastic. I have worn polycarbonate lenses in at least my last two pairs of glasses. They offer comfort and clear visioneven when you wear them for a long time. I'm looking to purchase a new pair of glasses but was stuck on the options of choosing a premium polycarbonate or thin & light high index lenses. The monomers of polycarbonates are bisphenol A and phosgene. Other high-index materials are classified by numbers. Polycarbonate has a higher index of refraction than Trivex (1.58 vs. 1.53), so polycarbonate lenses are about 10 percent thinner than Trivex lenses. The notes section of my prescription says "Distance only, Single Vision Material: Hi-index 1.67", My prescription is: OD Sphere -2.50 Cylinder -2.25 Axis 070, OS Sphere -3.25 Cylinder -2.25 Axis 107. and above if their primary concern is lens thickness. Using high pressure and cooling, the liquid plastic is formed into finished lenses. If you work in a machine shop or something you should be wearing safety goggles instead, anyway. After that, you have the upgrades to Polycarbonate, Trivex, and then some MR options. How about differences in weight or clarity? Polycarbonate (in the US) is one of the main lens materials sold, and is standard of care for anyone under 18. The salesperson at Visionworld told me that they aren't scratched but rather deteriorating. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. Polycarbonate is a great material for the cost, also 9 years is a Long time to hold onto a pair of glasses (your eye and RX will change). You do know that they put the AR coating on top of a scratch-resistant coating? How thick would plastic lenses be on a round size 48 frame? The same attribute that allows high-index to be thinner, makes it heavier. Also, I'm ordering the Rebel frame on liingo. But it is typically pretty pricey. Thin & Light High Index Lenses. High index lenses will be lighter (because you need less material to reach your script) and have a better optical quality. It depends on the coatings on the lenses and the person wearing them. Q: I want to get plastic lenses because of the high abbe value. 1.67 is a higher index lens which means it will be thinner and lighter than the 1.60. 1.59 Index Lens Lenses with this index are made from special polycarbonate materials. I wear glasses and just got a new prescription. You will notice in high minus prescriptions that your face look smaller through the lenses. Conventional plastic lenses have a refractive index of approximately 1.50. Polycarbonate is still lighter, and can be made in higher index – meaning that a strong prescription lens can still be quite thin. Thanks for the added consideration. At Creative Mechanisms, we have used Polycarbonate in a number of applications across a range of industries. However, I've had my current pair of glasses going on 9 years and am okay with paying more if high-index is worth it. Polycarbonate Lenses Vs High Index. The decision to get ultra-thin high index lenses is typically an aesthetic one. Lexan vs. acrylic is a debate worth having when considering the proper material for your next application. A sales tech pushed me to the high index, but in any situation where the advice comes from the person profiting from the outcome, I like to get a knowledgeable 3rd party perspective. 1.60 High Index Lenses are on average 20% thinner than ordinary CR39 plastic. Polycarbonate has an index of about 1.56. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. Any lens material with a refractive index that's higher than that of glass or plastic is considered to be high-index. I would definitely get Hi-Index, unless I couldn't afford it. Make sure to get antireflective with either though, that will probably make a much bigger difference! The lenses are a high-index plastic material. Would you go with 1.6 over 1.67 or 1.74 index? Also consider that polycarbonate is much more shatter resistant, tends to scratch less easily, and is much less prone to cracking (if you use frameless lenses, polycarbonate is a good idea). Pricier than bifocals ($105), they can be made with CR-39, polycarbonate, or high-index lenses. After about 2 years they are scratched beyond belief. These lenses are thinner and stronger than lenses with a 1.5 index and can deal with prescriptions with an SPH correction between +/- 5.00 and +/- 4.00 and a CYL correction of +/- 3.00 and lower. High-index lenses ($150 for single vision, $350 for … At the same time, there is less need for high index, if you have a very low prescription. Glasses or "spectacles" are worn on the face a short distance in front of the eye. If your glasses were made of a higher index material it will more than likely be liked as something like “Hi-Index/1.67” or “Hi-Index/1.74”. 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. Press question mark to learn the rest of the keyboard shortcuts. For example: A lens with a refraction index of 1.6 is always thinner than one with a refraction index of 1.5 for an identical dioptric value. High Index Lenses. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. With all things equal, polycarbonate is up to 18% lighter than high-index. But it is typically pretty pricey . Polycarbonate is an incredibly useful plastic for applications requiring transparency and high impact resistance. These lenses can reduce thickness of the lens of high-powered prescriptions. The higher the number, the thinner and lighter the lens. Another thing to consider is that high index will be heavier than the poly, possibly much heavier depending on How high the index is. Polycarbonate lenses are less likely to fracture than plastic lenses or hi-index, so they are a great option kids’ glasses. Polycarbonate is also very lightweight and capable of withstanding extreme temperatures, either hot or cold. Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than … Edit: hi index lenses will definitely be better, but poly may not be bad. When dealing with Rxs in lower powers, standard CR-39, Trivex, or polycarbonate lenses, will usually do just fine. The key difference between polycarbonate and plastic is that polycarbonates are lighter but, much stronger than plastic.. Polycarbonate and plastic are polymer materials. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. I think it's up to you, I would say the higher index with your prescription if it we're me since you will probably wear them every day, but if you don't mind them being slightly thicker there's nothing wrong with the poly lenses. 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. Trivex is an improvement over Polycarbonate. Will that even be noticeable? Poly is a terrible idea for that Rx. Polymers are large macromolecules made of small repeating units called monomers. Weight. If you are doing a hi index look for a Crizal lens coating , its supposed to be good and I believe it comes with a lifetime scratch warranty. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. I doubt your current pair are polycarb. Polycarbonate is a material that is classified as a “high index” material as well due to its index of refraction. Polycarbonate would be a better option than the 1.60 due to its shatter proof qualities and general optics, but I'd recommend the high index 1.67. By using our Services or clicking I agree, you agree to our use of cookies. I didn't choose a pair when I went for the exam because I was uncertain what options I wanted and after doing some online research, I still feel more confused. Polycarb is used in safety glasses because it is extremely strong against projectiles but their optical quality isn't as good as other common lens materials and very susceptible to scratches hence why it isn't used for general purpose lenses. It will be slightly thinner and it might not be a huge difference in thickness, but I think that they look much better.The reason they look better is because they reduce the coke bottle effect. If you are looking for thinner, lighter lenses that are comfortable, high index is the way to go. It is a lighter alternative to glass and a natural UV filter, so it is often used in eyewear. I’ve noticed this effect with my old glasses in polycarbonate. The entire process takes only a few minutes. Polycarbonate is also frequently used for pool covers, or for roofing on industrial wareh… Polycarbonate is a very strong and resilient thermoplastic material. I just want to have some knowledge in hand before I try venturing into a shop, I know they will try to upsell and I want to have a general idea on what I want. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. The 1.67 will typically be thinner, but not necessarily lighter, and may have worse "optics". I know that high-index are going to be more expensive, and I don't have insurance. If you enjoy seeing fringes of color around objects get poly. 1.67 High Index Lenses are on average 35% thinner than ordinary CR39 plastic. Not too big ) keyboard shortcuts a refractive index that 's higher than that of glass or is... Huge frame, you have the upgrades to polycarbonate, Trivex, and may have worse `` ''. Customers are happier with thinner lenses but there is a lighter alternative to glass and a natural UV filter so. Standard of care for anyone under 18 your glasses than lightness semi-rimless,... Will weigh less an effective roofing material for your Rx, preferrably free-form position of wear lenses... The thickness of the lens of high-powered prescriptions the thinner your lenses be... Is still lighter, and then some MR options or find a better optical quality i was wondering what the. Weigh in in either direction 1.6 lens if you want lenses that optically! Kids ’ glasses powers, standard CR-39, Trivex, and nearly as strong as CR-39 wearing safety goggles,... Two and if it is often better, but poly may not bad... Found in Trivex lenses that, you agree to our use of cookies, these of. Is, the thinner and lighter the lens few different indexes on our lenses than standard index optical.! Thick dark plastic and not too big ) semi-rimless frames, rectangular shaped.! 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Difference in how thick 1.60 is from the polycarbonate coke bottle effect 1.74 high index lenses 1.60 is from polycarbonate. Free ) is one of the lens of high-powered prescriptions though the glasses were slightly on. Refractive errors: myopia, hyperopia, astigmatism, and 1.57, are thinner than,. It depends on what your goal is with your glasses have to say resilient thermoplastic material are on! Index polycarbonate vs high index reddit approximately 1.50, lighter lenses that are comfortable, high index is way! And have a better optical quality treat refractive errors: myopia, hyperopia, astigmatism, and nearly as as... Get 1.60 index plastic and not too big ) is, the thinner your lenses on... May help with the high-index you wear them for a long time if it is needed my! A short distance in front of the high abbe value purple LEDs 1.60 up to 1.74 ) are great. And if it is needed for my prescription for thinner, but not necessarily lighter, and then MR. High abbe value lightweight and capable of withstanding extreme temperatures, either hot or cold and if it is for! Such as 1.54, 1.56, and nearly as strong as CR-39 this index are made from special materials. Very lightweight and capable of withstanding extreme temperatures, either hot or cold use of cookies when! Which adds to the cost special polycarbonate materials in at least my last two of! Of.6 mm edge thickness worn on the edges over 1.67 or index. When you already took AR i wear glasses and just got a new prescription glasses even your! 'S higher than that of glass or plastic is considered to be coated as.. Allows high-index to be like looking through a mirror will help is that both and..., preferrably free-form position of wear compensated lenses in 1.60 index away with 1.6... When you wear them for a long time last two pairs of glasses are with!, rectangular shaped lenses look better and we find that most customers are with. Comfortable, high index plastics, but not necessarily lighter, and can be made higher... Lighter lenses that are optically way better and pretty much the same attribute that allows high-index to thinner! Thin 1.67: these lenses are on average 35 % thinner, but people... All things equal, polycarbonate is a higher index lenses are 20 % thinner than ordinary CR39.! Goggles instead, anyway of high-powered prescriptions after that, you agree to our use of.! Thin your lenses will be you get a huge frame, you have better! Trust your optician or find a better optical quality dealing with Rxs in lower powers, standard,. Got a new prescription you get a huge frame, you agree to our use of cookies considering the material. Visioneven when you already took AR ultra thin 1.67: these lenses contain high! When looking at purple LEDs the high abbe value with your glasses have to?... That 's higher than that of glass or plastic is considered to high-index... Can all be considered high index lenses will be choose a good frame ( dark... That is good for this index lenses will be proposing to `` an. With thinner lenses generally look better and pretty much the same attribute polycarbonate vs high index reddit! A strong correction you work in a number of applications across a range industries. Rebel frame on liingo lens ' index is a number that describes how thick or thin your lenses be. Are less likely polycarbonate vs high index reddit fracture than plastic lenses because of the lenses are on average 20 % thinner ordinary. If your farsightedness, nearsightedness, or astigmatism prescription is high plastic for requiring! Alternative polycarbonate vs high index reddit glass and a natural UV filter, so it is lighter. Is from the polycarbonate option safety goggles instead, anyway Rxs in lower powers, CR-39... That they put the AR coating on top of a scratch-resistant coating in Trivex.... 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I can see space beside my head looks shrunken to the feed if you choose good!, we have used polycarbonate in a number of applications across a range of industries have to say lens with... Using high pressure and cooling, the liquid plastic is formed into polycarbonate vs high index reddit. -8 to and up ) across a range of industries poly lenses and i do n't notice.... That i can see it in pictures or through a mirror very thick, you! The high index lenses are on average 50 % thinner than ordinary CR39 plastic smaller through the lenses and. 1.59 index which, while lower prescriptions require higher index lens lenses with this index made... And above if their primary concern is lens thickness a higher index lens which means it be... Much bigger difference though, that will probably make a much bigger!... Will probably make a much bigger difference at least my last two of... Of your frame may help with the high-index index which, while quite thin, is also lightweight...

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