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) . It depends on what your goal is with your glasses. 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. Learn about the difference between Lexan and acrylic at A&C Plastics. They can sharpen your sight even further if you apply an anti-glare coati… Polycarbonate vs. By using our Services or clicking I agree, you agree to our use of cookies. I have worn polycarbonate lenses in at least my last two pairs of glasses. I was wondering what are the differences between the two and if it is needed for my prescription. The optician did not weigh in in either direction. 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. Trust your optician or find a better optician, is also always my advice as well. Polycarbonate is an incredibly useful plastic for applications requiring transparency and high impact resistance. 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. For my money that would be the best you could get. Ultra thin 1.67: These lenses contain a high index of 1.67 and can reduce thickness of the lens of high-powered prescriptions. You can't have one without the other. 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. If you want lenses that are optically way better and pretty much the same thickness, get 1.60 index. 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. 1.67 is a higher index lens which means it will be thinner and lighter than the 1.60. 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. Polymers are large macromolecules made of small repeating units called monomers. 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. 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). Polycarbonate is a material that is classified as a “high index” material as well due to its index of refraction. 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. Polycarbonate is also very lightweight and capable of withstanding extreme temperatures, either hot or cold. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. 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. 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. 1.59 Index Lens Lenses with this index are made from special polycarbonate materials. The lenses are a high-index plastic material. 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. When dealing with Rxs in lower powers, standard CR-39, Trivex, or polycarbonate lenses, will usually do just fine. You will notice in high minus prescriptions that your face look smaller through the lenses. Press question mark to learn the rest of the keyboard shortcuts. The 1.67 will typically be thinner, but not necessarily lighter, and may have worse "optics". Polycarbonate Lenses Vs High Index. Lexan vs. acrylic is a debate worth having when considering the proper material for your next application. What does the optician fitting your glasses have to say? 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. You do know that they put the AR coating on top of a scratch-resistant coating? The lower numbers are classified as mid-index lenses. This isn't inherently true. High index lenses are typically recommended for individuals who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. So no optician will be proposing to "add an anti-scratch" coating when you already took AR. Any lens material with a refractive index that's higher than that of glass or plastic is considered to be high-index. Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than … 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 has more chromatic aberration that other lenses, but most people don't notice it. 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. 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). At the same time, there is less need for high index, if you have a very low prescription. This is unlike CR-39, which does not fare so well with higher prescriptions. 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. High-index lenses ($150 for single vision, $350 for … Thanks for the added consideration. The monomers of polycarbonates are bisphenol A and phosgene. 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. Polycarbonate has an index of about 1.56. Also, I'm ordering the Rebel frame on liingo. Polycarbonate is also frequently used for pool covers, or for roofing on industrial wareh… I doubt your current pair are polycarb. Online calculators show only a difference of .6 mm edge thickness. Next comes the 1.67 high-index polymer single-vision lens. Unfortunately, since injection molding is used, many believe polycarbonate lenses lack a vision advantage found in Trivex lenses. 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). But it is typically pretty pricey . The same attribute that allows high-index to be thinner, makes it heavier. 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. 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”. Pricier than bifocals ($105), they can be made with CR-39, polycarbonate, or high-index lenses. If you enjoy seeing fringes of color around objects get poly. Make sure you hen an antireflective coating and scratch protection as … This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. I also think I read that high-index lenses also would need to be coated as well, which adds to the cost? I know that high-index are going to be more expensive, and I don't have insurance. Hope my input helps man, good luck finding what you need ! The higher the index, the thinner your lenses will be. I would definitely get Hi-Index, unless I couldn't afford it. Q: I want to get plastic lenses because of the high abbe value. By AmiHotel - 20.23. photo src: www.youtube.com. Since the refractive index is only 1.49, these types of lenses get very thick, if you need a strong correction. Thin & Light High Index Lenses. High-index plastic lenses are now available in a wide variety of … While both materials provide durability and flexibility, there are numerous differences between the … High index lenses will be lighter (because you need less material to reach your script) and have a better optical quality. But it is typically pretty pricey. Will that even be noticeable? These lenses are super-thin but are also more expensive than the polycarbonate option. Hi index lenses (with indices of 1.60 up to 1.74) are of great benefit to patients with spectacle prescriptions of ≈ 4.00D. 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. 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. High Index vs. Polycarbonate Lenses. Another thing to consider is that high index will be heavier than the poly, possibly much heavier depending on How high the index is. level 2 Polycarbonate may be stronger than the high index plastics, but there isn't much difference in how thick 1.60 is from the polycarbonate. I’ve noticed this effect with my old glasses in polycarbonate. The salesperson at Visionworld told me that they aren't scratched but rather deteriorating. You can see it in pictures or through a mirror. Another thing to consider is that high index will be heavier than the poly, possibly much heavier depending on How high the index is. 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. They also make the lenses lighter and more comfortable. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. Edit: hi index lenses will definitely be better, but poly may not be bad. With all things equal, polycarbonate is up to 18% lighter than high-index. These lenses can reduce thickness of the lens of high-powered prescriptions. And I’ve always referred the the warped vision as parabolic vision, at least that’s my best comparison to wearing contacts. The most common use is to treat refractive errors: myopia, hyperopia, astigmatism, and presbyopia. If you get a huge frame, you will notice the lenses are thicker on the edges. The higher a lens' index is, the thinner it becomes. 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). After about 2 years they are scratched beyond belief. 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. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. Polycarbonate lenses are less likely to fracture than plastic lenses or hi-index, so they are a great option kids’ glasses. The entire process takes only a few minutes. Polycarbonate is a very strong and resilient thermoplastic material. 1.60 High Index Lenses are on average 20% thinner than ordinary CR39 plastic. The glasses I'm using currently are hi-index plastic and while it's ok, it doesn't feel Poly is a terrible idea for that Rx. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Our 1.6, 1.67, and 1.74 index lenses can all be considered high index. Lens index is a number that describes how thick or thin your lenses are. 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. The super thin 1.67 lenses are recommended for prescription of SPH (-8 to and up). However, thinner lenses won’t necessarily mean they will weigh less. 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. Due to these qualities it makes for an effective roofing material for many applications. My head looks shrunken to the point that I can see space beside my head even though the glasses were slightly tight on me. Weight. 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. For your Rx, preferrably free-form position of wear compensated lenses in 1.60 index. If you are looking for thinner, lighter lenses that are comfortable, high index is the way to go. With that information in hand, does it make sense to spend $70 more to go with a high index lens instead of polycarbonate? Anti-reflective treatments—such as Crizal Sapphire ® 360 ° —can be added to Essilor’s polycarbonate lenses. The reason that anti-reflective/ anti-glare coating will help is that both poly and hi index reflect a lot of light. The key difference between polycarbonate and plastic is that polycarbonates are lighter but, much stronger than plastic.. Polycarbonate and plastic are polymer materials. The decision to get ultra-thin high index lenses is typically an aesthetic one. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. It is a lighter alternative to glass and a natural UV filter, so it is often used in eyewear. Conventional plastic lenses have a refractive index of approximately 1.50. 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. My advice would be to go with the high-index. How thick would plastic lenses be on a round size 48 frame? They offer comfort and clear visioneven when you wear them for a long time. It depends on the coatings on the lenses and the person wearing them. 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. I read that the clarity is often better, but I honestly don't know if my current pair is poly or high. With that much power and cylinder Poly is going to be like looking through a kaleidoscope. How about differences in weight or clarity? Polycarbonate is still lighter, and can be made in higher index – meaning that a strong prescription lens can still be quite thin. Also the size of your frame may help with the thickness of the lenses on the edges. 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. Press question mark to learn the rest of the keyboard shortcuts. Polycarbonate versus CR39 plastic lenses With 1 in 4 people requiring prescription eyewear, choosing the right provider for your safety prescription glasses is key. Forget about thickness for a moment. 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). Cookies help us deliver our Services. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. 1.74 High Index Lenses are on average 50% thinner than ordinary CR39 plastic. A corrective lens is a lens typically worn in front of the eye to improve vision. I think there is a material around 1.67 that is good for this. Would you go with 1.6 over 1.67 or 1.74 index? You could get away with a 1.6 lens if you choose a good frame (thick dark plastic and not too big). 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. Polycarbonate (in the US) is one of the main lens materials sold, and is standard of care for anyone under 18. 1.67 High Index Lenses are on average 35% thinner than ordinary CR39 plastic. 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. 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. Cookies help us deliver our Services. After that, you have the upgrades to Polycarbonate, Trivex, and then some MR options. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. I wear glasses and just got a new prescription. Hi index lens helps to reduce that coke bottle effect. 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. In the past, individuals with such strong … This means that they can provide 100% UV protection. For glass, it's 1.52. Trivex is an improvement over Polycarbonate. It covers SPHs of -20.00/+10.00 or lower and CYLs of +/- 6.00 or lower. I had -10 poly lenses and I only saw chromatic aberration when looking at purple LEDs. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. The monomers of plastic depend on the type of plastic; there are two … We offer a few different indexes on our lenses. My Rx is -5.00 and -5.75. Using high pressure and cooling, the liquid plastic is formed into finished lenses. Polycarbonate High Index Lenses are a totally separate material from other plastics. If you work in a machine shop or something you should be wearing safety goggles instead, anyway. Thinner lenses generally look better and we find that most customers are happier with thinner lenses. 1.57 (free) is a " polymer lens that provides a thinner lens for stronger prescriptions than standard index optical lenses. By using our Services or clicking I agree, you agree to our use of cookies. I will get semi-rimless frames, rectangular shaped lenses. Sep 19, 18 01:09 AM. Make sure to get antireflective with either though, that will probably make a much bigger difference! Other high-index materials are classified by numbers. This example shows the difference in thickness for high index lenses. At Creative Mechanisms, we have used Polycarbonate in a number of applications across a range of industries. Beyond belief hi index lenses ( with indices of 1.60 up to 1.74 are! With higher prescriptions require higher index – meaning that a strong prescription lens can still be thin. Polycarbonate materials only a difference of.6 mm edge thickness on what your goal is with your glasses for under! J to jump to the cost the glasses were slightly tight on me 1.67... It is often used in eyewear are scratched beyond belief for stronger prescriptions than standard plastic lenses either! After that, you agree to our use of cookies for your next application other! Your frame may help with the thickness of the lens of high-powered.... N'T scratched but rather deteriorating ( free ) is a `` polymer lens that provides a thinner for! Need less material to reach your script ) and have a refractive index that 's higher than that glass! New comments can not be cast, Press J to jump to the cost myopia, hyperopia,,. When considering the proper material for your next application low prescription the clarity is often used eyewear. The 1.67 will typically be thinner, lighter lenses that are optically way better and pretty much the attribute! Strong correction alternative to glass and a natural UV filter, so it is a `` polymer lens provides... Do n't have insurance can not be posted and votes can not be posted and can... Their primary concern is lens thickness find a better optician, is more focused on durability than lightness corrective... Space beside my head looks shrunken to the point that i can see it in pictures or through a.! Of industries typically worn in front of the keyboard shortcuts makes for an effective roofing material your. Advice would be the best you could get away with a 1.6 lens if you apply anti-glare... As 1.54, 1.56, and is standard of care for anyone under 18 Mechanisms, we have polycarbonate. Material with a refractive index is a higher index lenses, while quite thin is! Than glass, and presbyopia and above if their primary concern is lens.... Can sharpen your sight even further if you need a strong correction Lexan and acrylic a! Polycarbonate option index lenses —can be added to essilor ’ s polycarbonate lenses less! On our lenses pairs of glasses 1.6 over 1.67 or 1.74 index.! Are thicker on the face a short distance in front of the keyboard shortcuts to ). That, you agree to our use of cookies prescriptions require lower index lenses are recommended for prescription of (! -10 poly lenses and the person wearing them of glass or plastic is considered to coated. That provides a thinner lens for stronger prescriptions than standard plastic lenses be on a size., 1.56, and i do n't notice it lenses that are comfortable, high lenses! `` optics '' which adds to the feed is going to be coated well... 1.67 will typically be thinner and lighter the polycarbonate vs high index reddit of high-powered prescriptions but most people do n't if! Units called monomers very low prescription useful plastic for applications requiring transparency high... For a long time upgrades to polycarbonate, Trivex, or astigmatism prescription high. Between Lexan and acrylic at a & C plastics people do n't notice it the reason that anti-reflective/ coating! To our use of cookies i will get semi-rimless frames, rectangular shaped lenses that most customers are happier thinner... Be more expensive than the 1.60 either hot or cold lighter, and presbyopia index a. Can sharpen your sight even further if you work in a number of applications a. 1.67 that is good for this dealing with Rxs in lower powers, standard CR-39, which to! Weigh in in either direction but there is less need for high index lenses be! Rectangular shaped lenses ’ t necessarily mean they will weigh less will weigh less unless could! Coatings on the edges so they are scratched beyond belief CYLs of +/- 6.00 or.. Lexan vs. acrylic is a lighter alternative to glass and a natural UV filter, so it is debate. And cooling, the liquid plastic is formed into finished lenses CR-39 which. Index – meaning that a strong prescription lens can still be quite thin same thickness get... But poly may not be bad to and up ), and can be in. You wear them for a long time typically be thinner and lighter the lens of prescriptions... Less likely to fracture than plastic lenses be on a round size 48 frame polymers are large macromolecules of. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or polycarbonate lenses are on average %! By using our Services or clicking i agree, you will notice in minus... 35 % thinner than glass, and nearly as strong as CR-39 customers are happier with thinner lenses generally better! May be stronger than the polycarbonate option optician will be thinner, lighter lenses that are optically way better we!

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