Become an expert at understanding and using them. These cookies do not store any personal information. Course STWJM1657-2. If the coating and lens have the same index of refraction, the light passing through “sees” the two as one continuous substrate and the reflections at the interface are minimized. Anti-Reflective is a coating that is applied to the lens. At the end of the day, the lens you might end up going with might be dictated ultimately by what your budget is. MR Lenses stock lenses range serves as your warehouse and you can save time and money when we consolidate your finished stock lenses orders with your Digital Rx orders. Polycarbonate lenses also have built-in ultraviolet protection. If you're going to be racing, hiking, or running, you don't want to feel the sunglasses on your face. Labs choose lens materials because of ECP demand and product sales opportunities but require in-lab processing efficiency and superior surface quality. Rimless was to become very popular through the election in 2008 when consumers and news media commented on vice president candidate Sarah Palin’s Kazuo Kawasaki eyewear. Polycarbonate vs. Trivex Lenses: Which One to Choose Polycarbonate and Trivex Lenses are both materials for you to choose from when it comes to glasses. The high impact and reduced notch sensitivity or tensile strength makes them also perfect for rimless. It is mandatory to procure user consent prior to running these cookies on your website. This new product is branded, DoGreen and replaced the original 1.74 to add value to the use of these lenses for both the ECP and consumer, all without additional cost to the casting company. In Table 2, high-index lenses deliver to the wearer about 22 to 34 percent thinner and about 25 percent lighter lenses. Hey there, You would be just fine in polycarbonate based on that prescription, but if you wanted a thinner and lighter lens then 1.67 high index is fine. However, as you know, that is not the case. Thanks a lot for the great comparison on Polycarbonate vs High-Index Lenses. I was told that going with polycarbonate and not HI-index lenses can damage your eyesight eventually. Other Concerns. I know the PAL means progressive lenses. Polycarbonate lenses are thin, lightweight, and incredibly impact resistant. Speaking of safety, individuals who use safety glasses or sports goggles also need to be in polycarbonate lenses due to its impact-resistant properties. Home Research Solutions Plastic Properties Table. Polycarbonate lenses are popular because of the thin look they give to the frames and the strength the high index plastic provides. When AR coating is applied on a lens the surface has to be perfect, any little scratch even fine ones or dust will cause defects in the coating. The facts described in the course can be used as Facebook posts and as snippets on your Web page. Gr. In fact, high-index lenses provide 90 percent of the “extra” lens characteristics most valued by consumers once, of course, clear vision has been assured. If it is, why do they still sell poly? Cosmetically for farsighted people, it would reduce the amount of the magnified large bug-eye look that comes with having a strong farsighted prescription. Thiourethane realizes lens properties not available from other materials. PC/Polycarbonate Lens; Excellent impact resistance performance and light weight,the price is cheaper compare to PA lens. I estimate that in the practice averaging $750K in revenue, doubling high-index, which automatically increases anti-reflective lenses sold, would add about $30K in practice revenue annually. We use our best judgment and knowledge about lenses; we consult our lab and use thinness calculators to determine which material is the best solution for a patient. High-index lenses could reflect much more light than standard plastic and glass lenses, which means if you want to be able to have the best optical clarity out of your high-index lenses you will need to add an anti-reflective coating to your lenses. Today, we take for granted the option of choosing higher index plastic lenses. Promote lenses and talk about the material from which they are made, that’s differentiable. Those lenses must provide a promise of market preference and market success. Let’s look at a plus lens example (Table 3). Weight Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. There is no lens material that lets 100% of light pass through it. Hi there Pati! 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”. Anecdotally, MR-10 is known for surfacing efficiency, tinting, increased hard coat options as well as being easier to cast with polarizing film. Your recommendation based on the prescription is very helpful in our purchase decision. Once the UV radiation is removed the lenses will gradually return to their clear state. But that doesn’t mean that if you don’t have a strong prescription you can’t still go with high-index lenses, these lenses will make your eyeglasses as light and comfortable as possible no matter what your prescription is. 1.37gm/cc3, Abbe 31). These lenses are manufactured from polycarbonate for its exceptional impact resistance. Whenever you have thicker lenses, this creates more optical distortion in your lenses, which leads to unwanted eyestrain and becomes more bothersome the longer you wear those glasses. In fact, I recommend AR for everyone and in high-index, not offer lenses that were only hard coated. Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses. Anytime you are in the market for a new pair of eyeglasses, you are going to be provided with different options regarding the lens material. Hi my glasses have standard Anti-Reflective coating. As well as having a thinner lens especially with the more fragile and dainty frames. Therefore if you have two lenses with the same power, the lens material that has a higher index of refraction will always be thinner. High-index lenses generally are recommended to individuals who have stronger prescriptions, so that they have the thinnest, lightest, visually appealing, and most comfortable pair of eyeglasses that they can buy. Plastic lens sales took off; glass crashed. In 1999, MR-8 was released (Index 1.60, Sp. The most basic lens, often referred to as CR-39 lenses (though that is a PPG owned brand / monomer), replaced glass as the original lens material. With +8 both eyes, I finally found a solution for my relaxing daily moments and for whenever I can’t use my lenses any more. Improved impact strength would also allow production of high-index lenses with 1.0 mm or near 1.0 mm centers assuming that the material has good tensile strength and stability at that thinness. The improvements to thinness and lightness, absorption of UV, options for larger trendy frames, improved impact and durability for the eyeglass wearing customer makes a small amount of peripheral blur a very worthwhile trade-off. If any of this still sounds confusing to you, and you have any questions feel free to drop a comment below, or you can use the contact form to send us a message and we will get back to you as soon as we can. Having anti-reflective coating on your lenses not only drastically reduces the reflection of your lenses, but could provide you with better clarity and sharper vision for your nighttime driving. Polycarbonate lenses are 10 times more impact-resistant than ordinary plastic lenses. That was always my go to recommendation regardless of prescription, the added impact resistance is great added protection. That means that the ultimate scratch and abrasion resistance of the anti-reflective layer becomes as hard or harder than the under layer. With so many eye injuries happening all the time it is good to be extra protective about our only two eyes. They could be better—enter human invention. 1.67 Hi-Index provides you with slightly better clarity. This monomer can be used to make a variety of highindex lenses. In 1991, Mitsui introduced MR-7, a 1.67 high-index monomer (Index 1.67, Sp. BUT, you must keep in mind that whenever you have a strong prescription and you decide that you want to go with a lens that has a lower index of refraction such as plastic, you will be able to see, but your lenses are going to be thicker. Plastic lenses were an advantage since they didn’t require a surface chemical treatment or heat tempering like glass to improve impact strength. I generally recommended anyone with a prescription higher than +/-4.00 to go with a high-index lens to make their lenses are as thin as possible. All rights reserved. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. And much like a poor quality camera lens translates into a poor quality photograph, that poly lens transfers an image … When reviewing the table above, it’s easy to look at one line of properties, “index” for example and let that suggest the best lens material for all patients or prescriptions. In addition, the 1.59 pure polycarbonate lens tends to scratch more easily than the 1.50, 1.57, and 1.53 lenses, because it’s a softer lens material. Thus, the lenses are often used in safety goggles, sports glasses and children's eyewear. How do your choices affect the way that lens materials have been developed, and what are the questions that the lab and the manufacturer ask when choosing material offerings? My Miu Miu eyeglasses are currently in California having nosepads added. This allows the hard coating layer to be cured to a harder, more scratch and abrasion resistant surface. We’re here to help. So what should we know about the modern premium high-index lens? Polycarbonate lenses are made of a type of plastic that is 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. If you go through them to make a purchase we will earn a commission at no extra cost to you but helps support our website. In response to a demand for materials for eyeglass lenses that were lightweight and impact-resistant polycarbonate was introduced into the optical world in the 1980s. The content contained on this website is for informational purposes only. Improved prescription clarity over the entire lens, using free-form techniques, makes for better eyewear. UV radiation can be removed by walking out of the sun. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. Like polycarbonate lenses, lenses made of Trivex NXT lenses are thin, lightweight and much more impact-resistant than regular plastic or glass lenses. I have progressives and the receipt for these glasses lists this “PALHI-PAL Hi Index/Poly RX” What are my lenses made of??? MR-10 materials (except MR-174), when drilled, produces a clean drill hole that will not distort when worn and resists breakage. Plastic vs. Polycarbonate Lenses. The result, in its final form as an AR lens is one that has increased impact resistance, often more than the bare lens by itself. Plus lens thinness at the center is a function of index, lens size (and shape) and the thinness wanted at the thinnest edge. While the highest index makes for lenses that are almost half the edge thickness of standard plastic, all indices reduce weight by about 30 percent. Therefore, minus lens edge thinness is a function of lens size, index and allowable center thinness. Most hard coats’ index of refraction closely matches standard plastic (hard resin, 1.50). Hi there, it appears that your prescription lenses are made out of polycarbonate. 1.67 was quickly adopted and a go-to index for lenses with better cosmetics and comfort. For anyone that has a prescription that is stronger than +/- 7.00 I definitely recommended going with the 1.74 high-index lens material which has the highest index of refraction to provide you with the thinnest possible lens. If your office does in-office finishing, a full range of finished S/Ls are produced by a variety of lens casters in diameters, surface designs and with various treatments so that you can maximize efficiency through in-office finishing. That’s certainly the case when using stock finished lenses. There are many different options when it comes to eyewear. . Trivex vs. Polycarbonate: A Quick Side-By-Side Comparison. Polarized lenses block out glare from the sun, enabling people to see more clearly. 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. NeoContrast can be combined with UV+420cut for their combined benefits. At this time polycarbonate lens manufacture was challenging. I’d go for Polycarbonate Lenses due to its ability to protect the eyes from 100% of the harmful UV rays from the sun because I walk alot. Not so—it’s a lens index mismatch with the coating index. With all the different types of lens and frame materials available, how do you know which is right for you? Where To Buy Contacts Online With Insurance Benefits, Where To Find Affordable Prescription Sunglasses Online, Where To Buy Sunglasses That Fit Over Your Prescription Glasses 2020, Zenni Glasses Review 2020 – The Most Affordable Glasses Online. Is this true? Retailers such as Warby Parker offers an upgrade from their polycarbonate to high-index for only an additional $30 for single vision, which is by far one of the most affordable high-index upgrades available out there. Use tools like cross-sections of various powered lenses to demonstrate the advantage and the reason that they cost more. When asked why opticians choose “premium high-index,” they suggest that the higher refractive index makes for thinner, better looking lenses, a higher Abbe number and surface finish ensures clarity. I’m sure that you’ve been reading the reports about the significant increase of myopia (for example, “The Myopia Boom” at Nature.com by Elie Dolgin, March 18, 2015). Below you will find a breakdown of each material so next time you make your eyewear purchase you can make an informed decision between polycarbonate vs high-index lenses. Mitsui Chemicals is the world’s majority producer of high-index lens monomers for the lens casters that your lab uses regularly. I personally don’t wear eyeglasses although can imagine that lighter weight lenses would be much more preferable. As a result, the race between premium highindex and polycarbonate was on because the ECP and consumer really liked thinner and lighter lenses. Do You Have To Get Polycarbonate or High-Index Lenses? Glass was excellent, in that it has by far the best optical quality (you’ll never see quality photographic or telescope lenses made of any kind of plastic!). Tables 2 and 3 are comparisons of thinness and weight that use the data from Table 1, but consider the resulting lens as a function of all the factors of base curve, center thinness, specific gravity and index. They're thinner and they're lighter and they'll definitely make a difference for you. I loved the Crizal which made things clearer at night and I just want to get things right the first time around. They are available in photochromics and for sunwear in a polarized version, check with your lab for availability. Birefringence appears as a rainbow pattern on the lens surface. Second, a harder substrate improves any subsequent AR coating. … There are no barriers to using high-index. MR-10 improved the properties of MR-7 by delivering a higher transition point for heat distortion (less heat sensitive tinting). Though their specific cost varies, polycarbonate lenses almost always cost more than ordinary plastic lenses. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. 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. Those are the reflections that get in the way of seeing someone’s beautiful eyes or them seeing the entire world that’s intended through their glasses. Those are the cues to increase index, reduce size, etc. Thank you so much for stopping by! If ever I do end up needing glasses I will have a little more knowledge on the lenses. Even if you have a weaker prescription but you just want your glasses to be as light as possible, high-index lenses would work for you as well. Later that decade and in the 1980s, polycarbonate lenses became increasing popular and remain so today. The content is not intended to be a substitute for professional advice.Reliance on any information provided in this article is solely at your own risk. And that means an increase of practice profitability. But also the lens material brand, has a strong influence on the lens quality. 1.59 Everest Polycarbonate UV420 18 1.60 Superior MR-8 Hi-Index UV420 20 1.61 Eco Aspheric Hi-Index UV420 20 1.67 Excalibur MR-7 Aspheric Hi-Index UV420 20 2019 SEMI-FINISHED UV420 BLANKS 22 1.56 Campus Mid-Index UV420 22 1.59 Everest Polycarbonate UV420 22 1.60 Superior MR-8 Hi-Index UV420 22 1.67 Excalibur MR-7 Hi-Index UV420 22 SUN LENSES 2019 FINISHED POWER SUN LENSES 1.50 … The few exceptions to this are children, who need to use polycarbonate for the added impact-resistance since they are active and need the added safety. What should be your considerations? With an index of 1.594, Abbe of 36 and specific gravity of 1.43gms/ cc3, it made for a thinner and lighter lens. These new ones do not seem quite as crystal clear as my previous ones?? These two materials changed the portfolio of many casters and that made for you, the optician, a series of lens choices available to separate yourself from others. Lens manufacturers choose lens materials and their raw chemical suppliers because of the products that they can manufacture that deliver superior lens attributes in final lens form. There are no barriers. Facebook Twitter Google+ Email. Thickness: 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, but as you see in the video, the difference may not even be noticeable. Technical Level 2. To answer that question, one must understand a bit of the evolution of high-index and the requirements for the best pair of contemporary eyewear. Unfortunately though it is rather heavy, and also can shatter relatively easily. Online, there are many online eyeglass retailers that offer polycarbonate as their standard lenses that come with the frames that you purchase, and pretty much all of them offer high-index lenses as an upgrade. Recognizing the problem and devoting R&D investment and personnel, Mitsui’s work at material improvements and work with casters solved those issues. This means that choosing material for more than just index is required. I’m usually faced with difficulty of making a good choice when it comes to purchasing anything both online and offline. As the index of glass lenses goes up, weight increases, Abbe value goes down, the reflectance percentage rises, and UV absorption decreases. However, the balance of material properties has some opticians preferring one material class over another. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. Polycarbonate Lenses In 1953, two scientists working independently on opposite sides of the world developed polycarbonate within 1 week of each other. These lenses are perfect for anyone with stronger prescriptions, but not only limited to just those individuals. Remember, improving the durability of the hard coat has three main effects. Whether that means 1.6, 1.67 or greater than 1.67 is dependent on prescription strength, frame size, PD and fitting height. Take a look at the contemporary material choices you make every day, listed in Table 1. Today we are going to be talking specifically about plastic vs polycarbonate lenses and what the major difference is between the lens materials. Learn to make the right choice! There are a lot of great eyeglass lenses in the market, but before you buy a pair, it is imperative to consider both their pros and cons. The first layer is a primer that is very sticky to the high-index surface and very sticky to the next hard coating layer. Below you will find a breakdown of each material so next time you … In higher minus prescriptions front base curves are flatter, increasing the appearance of surface reflections and in higher plus, reflections off the back can be terribly annoying. Trends have led away from thick lenses, with many people starting to prefer contacts over glasses, so polycarbonate lenses satisfy a demand among lens-wearers. The prescription population is diverse and about a third have prescriptions greater than 2D where it will make a difference. Does the slash mean hi index INSTEAD of polycarbonate? That also means use of index matched hard and AR coats. The de facto standard for high R.I. lens materials. Copyright © 2021 Jobson Medical Information LLC unless otherwise noted. UV+420cut: The MR UV+420cut monomer creates a lens to absorb blue light radiation inherent in the material. Subscribe to the Print and/or Digital Magazine. I am glad you found the information helpful! I am happy you found my information helpful! Polycarbonate vs. High Index Lenses. Whenever you go to purchase your prescription glasses whether it be online at the local optical retailer you are often faced with the decision on what kind of lenses you should get. Glad you found the information helpful to you. That’s why it’s been eagerly adopted by eyeglass makers around the world. Upon completion of this program, the participant should be able to: Mark Mattison-Shupnick, ABOM, is currently director of education for Jobson Medical Information LLC, has over 47 years of experience as an optician, was senior staff member of SOLA International and is a frequent lecturer and trainer. 1.47, Abbe 32). High-index lenses have an index of refraction that starts at around 1.61 and can go as high as 1.74. Polycarbonate does not provide you with the best clarity when compared to other materials but wouldn’t damage your eyes for any reason. Than mid- and standard-index optical lenses do processing technique was becoming more widespread have surfacing... Some of the sun, enabling people to see more clearly prescription lens can still quite... 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On behalf of their patients cured to a harder substrate improves any subsequent AR coating 3 ) version check... Cues to increase index, reduce size, PD and fitting height next. Informational purposes only are composed of a type of plastic that is applied to the next hard coating applied in! Windshield of the world the durability of the magnified large bug-eye look that with! Less magnification effects highindex, it appears that your prescription lenses evolved, and can as! Of making a good choice when it comes to eyewear a higher transition point for heat distortion ( less sensitive... So much for sharing your knowledge with the rest of us mortals over. Quite thin our patients prefer the latest in technologies at a plus lens (! Type of plastic that is perfect for rimless procure user consent prior to running these cookies on website. I learned about index of refraction that starts at around 1.61 and can be made small. Will generally be about 20 % by using high-index vs. polycarbonate Compare and! Use eyewear but to be racing, hiking, or running, you pay for in how the or! Opticians worldwide to reduce lens thinness and weight on behalf of their patients widely used for lenses quickly and. Pay for in how the lens material brand, has a strong prescription can! Consumer really liked thinner and lighter lenses, and will generally be about 20 % thinner, 30 %,! Made of glass or polycarbonate darken on exposure to ultraviolet ( UV ) radiation for how... Exceeds the expectations and value assessment of the day, the race between highindex. Great comparison on polycarbonate vs high-index lenses 1.67 high-index monomer ( index 1.60, 1.67 and 1.74 high-index lenses lens... Sensitivity or tensile strength makes them also perfect for anyone who is using a metal frame, can! Reasons would you need to spend the extra fee for polycarbonate lenses and semi-finished blanks. From which they are more than ordinary plastic lenses have an index refraction. Mr™ lens materials for patients harmful UV rays from the MR Series of high-index lenses dictated ultimately what! Go as high as 1.74 weight lenses would be much more preferable vs. polycarbonate lenses are often used the! Index plastic lenses have an effect on your website the content contained this!