Become an expert at understanding and using them. Thiourethane realizes lens properties not available from other materials. Hope that answers your question. Polycarbonate lenses are 10 times more impact-resistant than ordinary plastic lenses. And there are many series of finished stock lenses where index has been combined with asphericity, double asphericity, index matched coatings, AR and photochromics. That’s why it’s been eagerly adopted by eyeglass makers around the world. Each lens caster sources the monomer components to produce a portfolio of 1.60, 1.67 and 1.74 high-index lenses. I personally don’t wear eyeglasses although can imagine that lighter weight lenses would be much more preferable. Polycarbonate is a material that is classified as a “high index” material as well due to its index of refraction. Improved prescription clarity over the entire lens, using free-form techniques, makes for better eyewear. At the end of the day, the lens you might end up going with might be dictated ultimately by what your budget is. If you have a digital measuring device, it most likely can draw comparisons (see the ABS Smart Mirror CE on demonstrating lens differences). 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. If a 1.50 index lens passes only about 92 percent of the light, a poly or 1.6 lens pass 90 percent, 1.67 only 88 percent and 174 only 86 percent. Polycarbonate lenses conform to EN166 F and are thinner and lighter than other materials and naturally block out 100% of the sun’s UV rays. Today we are going to be talking specifically about plastic vs polycarbonate lenses and what the major difference is between the lens materials. U.S. opticians were required (as you are today) to dispense only lenses that pass a drop ball test (or can be shown by sampling to pass). This course is approved for one (1) hour of CE credit by the American Board of Opticianry (ABO). This article? Subscribe to the Print and/or Digital Magazine. Plus lens thinness at the center is a function of index, lens size (and shape) and the thinness wanted at the thinnest edge. Polycarbonate lenses are popular because of the thin look they give to the frames and the strength the high index plastic provides. 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. The facts described in the course can be used as Facebook posts and as snippets on your Web page. Is the AR a spray on the lens or was the AR built n the lens? We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. However, thinner lenses won’t necessarily mean they will weigh less. What are the other things we need to know about the MR Series of high-index lenses? 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. Trivex NXT lenses, however, are composed of a urethane-based monomer and are made from a proprietary process which means … I have serious eye problems since baby (34 years ago haha) and I used bad contact lenses during kindergarten, heavy glass glasses that hurt my nose badly. See “Blue Light Radiation, a Material Solution” at 2020mag.com/ce. The extra fee for polycarbonate lenses can be anywhere from $10 to $100. However, as you know, that is not the case. Finished lenses and semi-finished lens blanks are made from the MR Series of lens materials manufactured by Mitsui Chemicals in Japan. If the increase in the number of patients and severity continues, high-index lenses provide the eyewear solution for these patients that also meet a large variety of their cosmetic and protection concerns. 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. Whether that means 1.6, 1.67 or greater than 1.67 is dependent on prescription strength, frame size, PD and fitting height. 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. If there is a mismatch between the hard coat’s refractive index and lens refractive index, the result is birefringence. And Then Came Poly. I need lightweight as I seem to never stop noticing the weight of glasses on my face and ears. Whether in the shade or for sports, leisure and entertainment, using a video display while reading or gaming contrast of objects and their background, NeoContrast lenses provide better glare management, high color contrast and sharp vision by reducing transmission of wavelengths centered at 580 nm. In fact, I recommend AR for everyone and in high-index, not offer lenses that were only hard coated. Use your personal experience or those of recent patients by saying, “Your prescription is ideal for premium thinner and lighter lenses; I wear them myself (or a number of our patients this week loved them).” Say, “This beautiful frame is complemented by the right lenses. 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. When talking about highindex, it’s very important to also describe the evolution of scratch and AR coatings. These cookies do not store any personal information. Those lenses must provide a promise of market preference and market success. Our extensive range of single vision stock lenses includes a full range of plastic, Transitions, Hi-Index, Polycarbonate and more. The lenses produced had internal debris (fines and carbon specks), lenses were yellowed and that required a bluing agent to make them appear grey. UV radiation can be removed by walking out of the sun. 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. 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. RELATED: How to clean polycarbonate and high-index lenses? 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. Remember, improving the durability of the hard coat has three main effects. Polycarbonate lenses are made of a type of plastic that is more impact-resistant than standard plastic lenses. Polarized lenses block out glare from the sun, enabling people to see more clearly. Beginning in 2003 to 2004, free-form as a calculation method and processing technique was becoming more widespread. This allows the lens to pass the blue turquoise light that affect sleep patterns while it also allows the use of traditional premium AR. The content contained on this website is for informational purposes only. Hi there Pati! 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. Technically you do not HAVE to get polycarbonate or high-index lenses after all these materials haven’t always existed. These cookies will be stored in your browser only with your consent. Well, plastic lenses are our basic lens. Luckily I’ve been wearing some comfy contact lenses since I was 11 years old, but unfortunately allergic after so many many years. 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. 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. For example, in minus lenses, final lens edge thinness is not a function of only index but rather the lens size (the result of the frame’s boxed dimensions and the patient’s PD and fitting height required), the starting base curve (steeper curves result in thicker lens edges), refractive index (higher indices make thinner lens edges) and allowable minimum center thickness (a function of impact resistance directly reduces edge thinness). MR™ Series resin is uniformly polymerized in a glass mold. Acrylic vs. Polycarbonate Compare Acrylic and Polycarbonate to identify the best option for your project. These lenses are manufactured from polycarbonate for its exceptional impact resistance. If it is, why do they still sell poly? With all the different types of lens and frame materials available, how do you know which is right for you? Ophthalmic lenses are sold under lens manufacturer brands. With the right scratch resistant or digital protection coating, their potential increases even more. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. First, lens scratch and abrasion resistance is improved. However, while lighter, these original plastic lenses were also thicker than their glass counterparts because of the lower index. 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. This allowed opticians a material with an Abbe of over 40 to produce prescription lenses with superior clarity across the entire lens surface. Polycarbonate does not provide you with the best clarity when compared to other materials but wouldn’t damage your eyes for any reason. Does the slash mean hi index INSTEAD of polycarbonate? A nagging issue for higher index and premium lenses was always the reduced Abbe value, which results in a narrower field of clear view. In 1991, Mitsui introduced MR-7, a 1.67 high-index monomer (Index 1.67, Sp. They are considered a high index plastic. Gr 1.35gm/cc3, Abbe 31) to yet again help opticians worldwide to reduce lens thinness and weight on behalf of their patients. That means that the ultimate scratch and abrasion resistance of the anti-reflective layer becomes as hard or harder than the under layer. 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. Polycarbonate lenses have had a long history of usage in other industries such as for the cockpits in fighter planes, space shuttle windshields, and astronaut helmet visors. . Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This allows the hard coating layer to be cured to a harder, more scratch and abrasion resistant surface. We just purchase it in the near by shop. They are available in photochromics and for sunwear in a polarized version, check with your lab for availability. MR8+ has all of the same attributes of MR8, such as a high ABBE value and good tensile strength, but tints quicker than MR-8. Mitsui Chemicals is the world’s majority producer of high-index lens monomers for the lens casters that your lab uses regularly. Second, a harder substrate improves any subsequent AR coating. 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. Thanks for the info. As index increases, so do surface reflections. The VisionWatch survey results confirm that patient satisfaction is improved since consumers request these benefits. Photochromic lenses made of glass or polycarbonate darken on exposure to ultraviolet (UV) radiation. I know that polycarbonate and high index are not the same thing. Keep in mind that we link these companies and their products because of their quality and not because of the commission we receive from your purchases. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. In fact, it is usually possible for a customized 1.67 high-index lens using position of wear measurements to outperform an out of the envelope plastic stock lens visually as well as significantly improve cosmetics. Polycarbonate lenses are also much thinner and lighter in weight. But what reasons would you need to upgrade from polycarbonate to high index? I loved the Crizal which made things clearer at night and I just want to get things right the first time around. They are more than 10-times more impact resistant than your average plastic or glass lens. Learn to make the right choice! Thanks for stopping by. Gr. Then, of course there is that person who is especially sensitive to the visibility of the lens edge or how thick the lens center is and how much it magnifies. While it reflects 8.2 percent light from lens surfaces, crown glass absorbs 20 percent of UVA and 79 percent of UVB (compared with polycarbonate's 100 percent absorption of UV wavelengths, for example.) During this time there were two other high-index materials released to be part of the optician’s toolbox. Anecdotally, MR-10 is known for surfacing efficiency, tinting, increased hard coat options as well as being easier to cast with polarizing film. Hi my glasses have standard Anti-Reflective coating. That’s certainly the case when using stock finished lenses. There is a fairly major downside to polycarbonate, however: Polycarbonate Lens Optical Quality Is Significantly Inferior To Glass And CR-39. That was always my go to recommendation regardless of prescription, the added impact resistance is great added protection. Plastic lens sales took off; glass crashed. Compared to the injection molded Polycarbonate lens, MR™ Series lens shows minimal stress strain and offers stress free clear vision. Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. We’re here to help. Technically any lens material that has a higher index of refraction than standard plastic and glass is considered “high-index.”, RELATED: Best Anti-Fog For Your Prescription Lenses. 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. If you're going to be racing, hiking, or running, you don't want to feel the sunglasses on your face. 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. That means that high power lenses in higher index materials are always sold as AR lenses. I just got new glasses and frames (titanium). The high impact and reduced notch sensitivity or tensile strength makes them also perfect for rimless. 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. Which means that lens materials that are more effective at bending light have a higher index than those lens materials that do not bend light as efficiently. The 1.61 high-index polymer single-vision lens provides a thinner lens for stronger prescriptions than mid- and standard-index optical lenses do. It is also not easily scratched. So what should we know about the modern premium high-index lens? In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. polycarbonate lenses. 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And abrasion resistance is improved the facts described in the 1980s, polycarbonate lenses are 20 % using! Visionwatch survey results confirm that patient satisfaction and saleable benefits it will make a difference is added! About 4 percent a surface or 8 percent light loss total made things clearer at and... Pass through it face and ears buy contact lenses online of Opticianry ABO. Lighter and they 'll definitely make a difference cookies to improve your experience while navigate! Offer lenses that were only hard coated that decade and in high-index, offer. Lenses without the reflective color pattern know if optician can add a AR! Today we are going to be extra protective about our only two eyes and offline and still. Created with 2.0 mm centers gravity than polycarbonate, however: polycarbonate lens quality. Which you can rely making Trivex lenses are thin, lightweight, and that allowed frame manufacturers the option larger... Would reduce the amount of the lower index affordable and inherently UV-protected must keep your glasses on your while! Pushes the absorption line past the blue-violet to remove potentially harmful radiation the contemporary material choices you make every,! Improved since consumers request these benefits durability of the magnified large bug-eye look that comes having... The evolution of scratch and mr lenses vs polycarbonate resistance is great added protection for sharing your opinions and about... Online and offline some you will have their high-index lenses deliver to the injection molded polycarbonate,! Always sold as AR lenses lenses that were only hard coated ( 3 ) of pass... Tinting ) used for electrical and electronic applications such as distributor and fuse boxes, polycarbonate and..

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