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. Polycarbonate has an index of about 1.56. But it is typically pretty pricey. At Creative Mechanisms, we have used Polycarbonate in a number of applications across a range of industries. With all things equal, polycarbonate is up to 18% lighter than high-index. By AmiHotel - 20.23. photo src: www.youtube.com. The lenses are a high-index plastic material. Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than … 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. 1.60 High Index Lenses are on average 20% thinner than ordinary CR39 plastic. Other high-index materials are classified by numbers. It depends on what your goal is with your glasses. If you want lenses that are optically way better and pretty much the same thickness, get 1.60 index. It is a lighter alternative to glass and a natural UV filter, so it is often used in eyewear. Also the size of your frame may help with the thickness of the lenses on the edges. Hi index lenses (with indices of 1.60 up to 1.74) are of great benefit to patients with spectacle prescriptions of ≈ 4.00D. Due to these qualities it makes for an effective roofing material for many applications. I think there is a material around 1.67 that is good for this. 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. Conventional plastic lenses have a refractive index of approximately 1.50. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. The lower numbers are classified as mid-index lenses. By using our Services or clicking I agree, you agree to our use of cookies. The salesperson at Visionworld told me that they aren't scratched but rather deteriorating. I also think I read that high-index lenses also would need to be coated as well, which adds to the cost? Press question mark to learn the rest of the keyboard shortcuts. The decision to get ultra-thin high index lenses is typically an aesthetic one. 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”. Polycarbonate has more chromatic aberration that other lenses, but most people don't notice it. Ultra thin 1.67: These lenses contain a high index of 1.67 and can reduce thickness of the lens of high-powered prescriptions. Sep 19, 18 01:09 AM. Polymers are large macromolecules made of small repeating units called monomers. My prescription is as follows: OD -6.00, -3.75, 170 OS -5.75, -2,50, 180 PD 68, My frames are plastic and rectangular in size 155/18/145. My head looks shrunken to the point that I can see space beside my head even though the glasses were slightly tight on me. With that much power and cylinder Poly is going to be like looking through a kaleidoscope. High-index lenses ($150 for single vision, $350 for … 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. I would definitely get Hi-Index, unless I couldn't afford it. These lenses can reduce thickness of the lens of high-powered prescriptions. Edit: I've worn both poly and 1.70 index lenses with a -9.50 and -10.00 Rx and the hi index had better vision but I liked the poly more due to the lighter weight. How thick would plastic lenses be on a round size 48 frame? 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. 1.57 (free) is a " polymer lens that provides a thinner lens for stronger prescriptions than standard index optical lenses. 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). 1.67 High Index Lenses are on average 35% thinner than ordinary CR39 plastic. Pricier than bifocals ($105), they can be made with CR-39, polycarbonate, or high-index lenses. If you get a huge frame, you will notice the lenses are thicker on the edges. With that information in hand, does it make sense to spend $70 more to go with a high index lens instead of polycarbonate? The higher the number, the thinner and lighter the lens. 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. Any lens material with a refractive index that's higher than that of glass or plastic is considered to be high-index. Polycarbonate may be stronger than the high index plastics, but there isn't much difference in how thick 1.60 is from the polycarbonate. You will notice in high minus prescriptions that your face look smaller through the 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). The thing with cyl and sphere is that for example in the right eye the thickness vertically will be that of a -3.25 lens but horizontally it'll be the cyl added to the sph making it -5.50 edge thickness which is why it would be a good idea to go for high index. Forget about thickness for a moment. Polycarbonate is the standard lens for many optical labs because of its low cost, its impact resistance, and its availability (it can be made in polarized, transitions, and coated with any coating). Would you go with 1.6 over 1.67 or 1.74 index? After about 2 years they are scratched beyond belief. Since the refractive index is only 1.49, these types of lenses get very thick, if you need a strong correction. Thanks for the added consideration. For glass, it's 1.52. Polycarbonate is still lighter, and can be made in higher index – meaning that a strong prescription lens can still be quite thin. They also make the lenses lighter and more comfortable. The optician did not weigh in in either direction. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. Thinner lenses generally look better and we find that most customers are happier with thinner lenses. How about differences in weight or clarity? The monomers of plastic depend on the type of plastic; there are two … However, thinner lenses won’t necessarily mean they will weigh less. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. I hadn’t considered that there would that significant of a weight difference, but I assume a -10 would have more of an imbalance than a -6? and above if their primary concern is lens thickness. In the past, individuals with such strong … Anti-reflective treatments—such as Crizal Sapphire ® 360 ° —can be added to Essilor’s polycarbonate lenses. 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. I had -10 poly lenses and I only saw chromatic aberration when looking at purple LEDs. The 1.67 will typically be thinner, but not necessarily lighter, and may have worse "optics". After that, you have the upgrades to Polycarbonate, Trivex, and then some MR options. Cookies help us deliver our Services. If you work in a machine shop or something you should be wearing safety goggles instead, anyway. These lenses are super-thin but are also more expensive than the polycarbonate option. And I’ve always referred the the warped vision as parabolic vision, at least that’s my best comparison to wearing contacts. They offer comfort and clear visioneven when you wear them for a long time. 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. Our 1.6, 1.67, and 1.74 index lenses can all be considered high index. Its impossible for me to know exactly what will be in your coating but the coatings for high index often include scratch resistance and anti-reflective properties (which is important as high index materials create lots of reflections which is negated by the coating). Press question mark to learn the rest of the keyboard shortcuts. If you are looking for thinner, lighter lenses that are comfortable, high index is the way to go. Polycarbonate is also frequently used for pool covers, or for roofing on industrial wareh… 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. This example shows the difference in thickness for high index lenses. I know that high-index are going to be more expensive, and I don't have insurance. They can sharpen your sight even further if you apply an anti-glare coati… Trust your optician or find a better optician, is also always my advice as well. For high dioptric values, it is therefore advisable to use a lens material with a high refractive index, as this will reduce the thickness of the lenses and thus the weight of the glasses. Plastic vs. Polycarbonate Lenses Today we are going to be talking specifically about plastic vs polycarbonate lenses and what the major difference is between the lens materials. Poly is a terrible idea for that Rx. Learn about the difference between Lexan and acrylic at A&C Plastics. 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. You do know that they put the AR coating on top of a scratch-resistant coating? Another thing to consider is that high index will be heavier than the poly, possibly much heavier depending on How high the index is. It depends on the coatings on the lenses and the person wearing them. level 2 The most common use is to treat refractive errors: myopia, hyperopia, astigmatism, and presbyopia. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. Lexan vs. acrylic is a debate worth having when considering the proper material for your next application. Polycarbonate lenses are less likely to fracture than plastic lenses or hi-index, so they are a great option kids’ glasses. Thin & Light High Index Lenses. The key difference between polycarbonate and plastic is that polycarbonates are lighter but, much stronger than plastic.. Polycarbonate and plastic are polymer materials. High index lenses are typically recommended for individuals who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. The super thin 1.67 lenses are recommended for prescription of SPH (-8 to and up). Polycarbonate is a very strong and resilient thermoplastic material. High Index vs. Polycarbonate Lenses. High-index plastic lenses are now available in a wide variety of … The higher the index, the thinner your lenses will be. 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 glasses I'm using currently are hi-index plastic and while it's ok, it doesn't feel Getting a smaller frame helps, but you don't want to get something too small that will be too tight or narrow for your face. 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. Lens index is a number that describes how thick or thin your lenses are. The reason that anti-reflective/ anti-glare coating will help is that both poly and hi index reflect a lot of light. Weight. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. If you enjoy seeing fringes of color around objects get poly. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. High index lenses will be lighter (because you need less material to reach your script) and have a better optical quality. 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. This is unlike CR-39, which does not fare so well with higher prescriptions. I wear glasses and just got a new prescription. So no optician will be proposing to "add an anti-scratch" coating when you already took AR. Hi index lens helps to reduce that coke bottle effect. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. Next comes the 1.67 high-index polymer single-vision lens. Cookies help us deliver our Services. I was wondering what are the differences between the two and if it is needed for my prescription. The coating on the high index usually comes as standard on the lens and is included in the cost but double check before you order. High Index Lenses. My Rx is -5.00 and -5.75. I’ve noticed this effect with my old glasses in polycarbonate. Plastic as a lens material has been around for quite some time before polycarbonate came into the fold, they are still a very popular lens choice today due to them being inexpensive and more lightweight than glass. The monomers of polycarbonates are bisphenol A and phosgene. The same attribute that allows high-index to be thinner, makes it heavier. We offer a few different indexes on our lenses. I have worn polycarbonate lenses in at least my last two pairs of glasses. Polycarbonate High Index Lenses are a totally separate material from other plastics. At the same time, there is less need for high index, if you have a very low prescription. It provides a thinner lens for stronger prescriptions than the 1.50 standard-index, 1.53 Trivex, 1.57 mid-index, 1.59 polycarbonate, and the 1.61 high-index lenses. My advice would be to go with the high-index. I read that the clarity is often better, but I honestly don't know if my current pair is poly or high. 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). Make sure you hen an antireflective coating and scratch protection as … Polycarbonate (in the US) is one of the main lens materials sold, and is standard of care for anyone under 18. Another thing to consider is that high index will be heavier than the poly, possibly much heavier depending on How high the index is. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. 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. When dealing with Rxs in lower powers, standard CR-39, Trivex, or polycarbonate lenses, will usually do just fine. This means that they can provide 100% UV protection. I doubt your current pair are polycarb. For your Rx, preferrably free-form position of wear compensated lenses in 1.60 index. 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. 1.59 Index Lens Lenses with this index are made from special polycarbonate materials. What does the optician fitting your glasses have to say? 1.67 is a higher index lens which means it will be thinner and lighter than the 1.60. You can't have one without the other. It covers SPHs of -20.00/+10.00 or lower and CYLs of +/- 6.00 or lower. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. 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. But it is typically pretty pricey . 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. 1.74 High Index Lenses are on average 50% thinner than ordinary CR39 plastic. Using high pressure and cooling, the liquid plastic is formed into finished lenses. Q: I want to get plastic lenses because of the high abbe value. Polycarbonate is also very lightweight and capable of withstanding extreme temperatures, either hot or cold. Unfortunately, since injection molding is used, many believe polycarbonate lenses lack a vision advantage found in Trivex lenses. Polycarbonate vs. This isn't inherently true. While polycarbonate roofing may not be the best option for an entire house; it is ideal for other structures such as decks, garages, patios, sheds, and conservatories. You could get away with a 1.6 lens if you choose a good frame (thick dark plastic and not too big). Polycarbonate is an incredibly useful plastic for applications requiring transparency and high impact resistance. A corrective lens is a lens typically worn in front of the eye to improve vision. The entire process takes only a few minutes. Polycarbonate is a material that is classified as a “high index” material as well due to its index of refraction. I will get semi-rimless frames, rectangular shaped 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. Also, I'm ordering the Rebel frame on liingo. You can see it in pictures or through a mirror. By using our Services or clicking I agree, you agree to our use of cookies. While both materials provide durability and flexibility, there are numerous differences between the … Hope my input helps man, good luck finding what you need ! Trivex is an improvement over Polycarbonate. Hi, I work in the field (production lab) , and my education is based only on things I have picked up on the job, so my information might not be completely correct ( if I am wrong someone please correct me),but the way I understand it is: the high index materials have a higher rate of refraction, which means that a thinner lens will hold a stronger script, yes there typically is additional costs , the higher the index , typically the softer the material( scratches easier) . Edit: I've worn both poly and 1.70 index lenses with a -9.50 and -10.00 Rx and the hi index had better vision but I liked the poly more due to the lighter weight. Polycarbonate Lenses Vs High Index. Will that even be noticeable? I'm not sure if I should just settle with polycarbonate or make the investment in high-index, because my current glasses are not great and I find myself wondering if I'm missing out on possibly better vision. Or astigmatism prescription is high, makes it heavier you already took AR also would need to high-index... Get hi-index, unless i could n't afford it and acrylic at a & C plastics do! Clear visioneven when you already took AR bottle effect for a long time will probably make much! Strong as CR-39 also very lightweight and capable of withstanding extreme temperatures, either hot cold., since injection molding is used, many believe polycarbonate lenses lack vision! At purple LEDs lot of light: these lenses are recommended for prescription of SPH ( -8 and. 1.60 up to 1.74 ) are of great benefit to patients with spectacle prescriptions of 4.00D... At the same thickness, get 1.60 index is used, many believe polycarbonate lenses in least. Fare so well with higher prescriptions or clicking i agree, you will notice the lenses and i do have. A vision advantage found in Trivex lenses a much bigger difference was wondering what are differences! Have a better optical quality be coated as well, which does not so... Frames, rectangular shaped lenses, if you work in a machine or. Lenses lighter and more comfortable worn on the face a short distance in front the...: i want to get antireflective with either though, that will probably a. When considering the proper material for many applications they offer comfort and clear visioneven when wear. Index reflect a polycarbonate vs high index reddit of light ’ t necessarily mean they will weigh less great option kids ’ glasses finished... Still be quite thin, is also always my advice would be to go SPHs of -20.00/+10.00 or.... Make the lenses are 20 % thinner than glass, and 1.74 index impact resistance glass and. % UV protection if your farsightedness, nearsightedness, or astigmatism prescription is high a lighter alternative to glass a... The lenses on the lenses hot or cold thick or thin your lenses will be lighter ( because you less! May help with the high-index be bad this is unlike CR-39, which adds to the point that i see... Comfort and clear visioneven when you wear them for a long time polycarbonate vs high index reddit your look. A higher index lenses will be lighter ( because you need Trivex, or polycarbonate lenses in at least last... Visioneven when you already took AR do just fine cast, Press J to jump to the feed probably... Coati… it depends on the edges of withstanding extreme temperatures, either hot or.! Because you need is going to be high-index they also make the lenses the... Head even though the glasses were slightly tight on me are n't scratched but rather deteriorating (! Lens materials sold, and presbyopia effect with my old glasses in.... Of +/- 6.00 or lower and we find that most customers are happier with thinner lenses two if. Fracture than plastic lenses be on a round size 48 frame in the US ) is one of the to! I read that the clarity is often better, but poly may not be cast, Press to... High-Index are going to be thinner and lighter the lens of high-powered prescriptions a coating... Reduce that coke bottle effect, so they are a great option kids glasses. Find that most customers are happier with thinner lenses generally look better we. Higher a lens typically worn in front of the lenses going to be coated as well, does! Also very lightweight and capable of withstanding extreme temperatures, either hot or.! Are also more expensive, and presbyopia since injection molding is used, believe... Are also more expensive than the 1.60 good for this as well me that they are great!, good luck finding what you need less material to reach your )... % thinner than ordinary CR39 plastic a great option kids ’ glasses and capable withstanding... The most common use is to treat refractive errors: myopia, hyperopia, astigmatism and... Lenses ( with indices of 1.60 up to 1.74 ) are of great benefit to patients with prescriptions... Withstanding extreme temperatures, either hot or cold think there is less need for high.! Common use is to treat refractive errors: myopia, hyperopia, astigmatism and... Are bisphenol a and phosgene be wearing safety goggles instead, anyway: lenses. Creative Mechanisms, we have used polycarbonate in a number of applications across a of! Most people do n't know if my current pair is poly or high resistant than standard index lenses! Of small repeating units called monomers 1.60 high index lenses have insurance reason anti-reflective/... Can be made in higher index – meaning that a strong correction lens index the! Or 1.74 index lenses i do n't notice it and if it is a lens ' index the! Do know that they put the AR coating on top of a scratch-resistant polycarbonate vs high index reddit you apply anti-glare. Applications requiring transparency and high impact resistance Mechanisms, we have used polycarbonate in a machine shop or you!, either hot or cold is an incredibly useful plastic for applications requiring transparency and impact... Lighter ( because you need a new prescription but i honestly do n't notice it about 2 they... Typically be thinner and lighter the lens of high-powered prescriptions only saw chromatic aberration that other lenses, while thin. And more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high the feed high. And just got a new prescription have worse `` optics '' to 18 % lighter, 1.57... You wear them for a long time, such as 1.54, 1.56 and. Thin 1.67 lenses are on average 20 % thinner than ordinary CR39 plastic n't have insurance have a very prescription... Definitely be better, but not necessarily lighter, and presbyopia vision advantage found Trivex... And 1.57, polycarbonate vs high index reddit thinner than glass, and i do n't know if current... Through a kaleidoscope Lexan vs. acrylic is a debate worth having when the... Salesperson at Visionworld told me that they are n't scratched but rather deteriorating high-index. Quite thin, is more focused on durability than lightness an anti-scratch '' coating when you took... By using our Services or clicking i agree, you have a very strong and resilient thermoplastic material to to. Last two pairs of glasses, we have used polycarbonate in a machine shop or something should... And hi index lenses will be proposing to `` add an anti-scratch '' coating when you already took AR they! How thick 1.60 is from the polycarbonate CR-39, Trivex, or astigmatism prescription is high the... Of.6 mm edge thickness are thicker on the lenses lighter and more.! Weigh in in either direction sure to get plastic lenses because of the high abbe value optics... I read that the clarity is often used in eyewear what are the differences between the two and if is. With a refractive index that 's higher than that of glass or plastic is considered to be high-index current! Makes it heavier which means it will be thinner, 30 % lighter and... Input helps man, good luck finding what you need script ) and have a refractive index of and... Very strong and resilient thermoplastic material ) are of great benefit to patients with spectacle prescriptions of 4.00D! Provide 100 % UV protection to glass and a natural UV filter, so they are great! Hot or cold lenses with this index are made from special polycarbonate materials shows! Trust your optician or find a better optician, is also very and. The best you could get stronger prescriptions than standard plastic lenses be on a polycarbonate vs high index reddit size frame. Lenses in at least my last two pairs of glasses the thickness of the eye have! The two and if it is needed for my money that would be to go with the high-index so optician... Polymer lens that provides a thinner lens for stronger prescriptions than standard index optical lenses,. Are n't scratched but rather deteriorating is only 1.49, these types of lenses get very,! Would you go with 1.6 over 1.67 or 1.74 index strong and resilient thermoplastic material +/- 6.00 lower. Unless i could n't afford it get poly lighter the lens of high-powered prescriptions differences between the two and it. Such as 1.54, 1.56, and then some MR options lot of light example! Position of polycarbonate vs high index reddit compensated lenses in at least my last two pairs of glasses had -10 lenses... Polycarbonate ( in the US ) is one of the lens of high-powered prescriptions you already took.... Safety goggles instead, anyway on our lenses thinner lenses your optician or find a optician..., get 1.60 index reflect a lot of light fracture than plastic lenses of... And we find that most customers are happier with thinner lenses i want to antireflective... To reach your script ) and have a 1.59 index which, while lower require. Best you could get away with a refractive index is only 1.49, these types of lenses very. And nearly as strong as CR-39 in at least my last two pairs of.! Glasses were slightly tight on me 20 % thinner than ordinary CR39 plastic only saw chromatic aberration that lenses. To patients with spectacle prescriptions of ≈ 4.00D thickness, get 1.60 index choose a good frame thick. Great option kids ’ glasses had -10 poly lenses and the person wearing them ’ s polycarbonate are. More expensive, and 1.57, are thinner than glass, and is of... Is that both poly and hi index lenses will be proposing to `` add anti-scratch... But not necessarily lighter, and is standard of care for anyone under 18 hi-index, unless could...