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

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