The advantages of this material of course are because of its properties. These lenses have good impact resistance, making them ideal for children, sports and industrial work. Trivex lenses, however, are composed of a urethane-based monomer and are made from a cast moulding process similar to how regular plastic lenses are made. Polycarbonate was developed in the 1960s for aerospace applications and is currently used for the helmet visors of astronauts and pilots and was used for the windscreens of the space shuttles. In fact, I wear polycarbonate for my lenses. Your optometrist can discuss the pros and cons of polycarbonate and Trivex lenses, and help you decide which lens material is the best choice for your needs and budget. The lenses in my specs are scratched. Poor scratch resistance. They also offer 100 percent protection from the sun's harmful UV rays and are up to 10 times more impact-resistant than plastic or glass lenses. Polycarbonate lenses are about 10% thinner than Trivex lenses. Although you can still see them when you have a direct line-of-sight, moving to different angles can make the screen disappear completely. First of all, they are so durable that they are hard to get shattered even in the roughest conditions. Believe it or not, it has more advantages for sunglasses and for those who wear it. Polycarbonate lenses are very resistant to tint in contrast to plastic lenses which accepts tints. Its superiority doesn’t mean polycarbonate lenses don’t provide a clear picture — just that glass offers more clarity. High-quality polycarbonate lenses are not the cheapest option on the market. All About Vision and AllAboutVision.com are registered trademarks of AAV Media, LLC. sunglasses are very different from each other as the sunglasses have a set tint that protects our eyes from glares but they are not changeable whereas the photochromic lenses easily adapt to the nature of the light present around and changes accordingly. The three main topics when discussing potential disadvantages of yellow-tinted blue-light-absorbing lenses are complaints of scotopic vision loss, altered color perception, and sleep disturbance. High price is one of the major disadvantages of polycarbonates. The problem is, people think it's bad for their health. © 2000-2021 AAV Media, LLC. Disadvantages of Trivex Lenses . First things first, I would like to apologize for my extended absence. Trivex lenses offer better clarity for both central and peripheral vision. Photochromic lenses are available in Trivex as well. ... Polycarbonate lenses provide both higher impact resistance and 100% UV protection naturally, taking care of the two main safety concerns when shooting outdoors. This combination of lightweight comfort, UV protection and impact resistance also makes these lenses an excellent choice for children's glasses and safety glasses. Polycarbonate lenses are made by injection moulding. P olycarbonate roofing sheets disadvantages. Answer: Polycarbonate lenses are made by injection moulding. The melted polycarbonate is then rapidly injected into lens moulds, compressed under high pressure and cooled to form a finished lens product in a matter of minutes. What are the advantages and disadvantages of polycarbonate spectacle lenses? Disadvantages include the fact that their abrasion resistance is poor - adding an anti-scratch coating can help but reduces the impact resistance slightly. Polycarbonates are not very resistant to scratching, marring and abrasive surfaces. That allows you to do close-up work (like reading a book), middle-distance work (like checking out … Give your hearing a check-up with our team of expert audiologists. 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. Polycarbonate and Trivex lenses both block 100 percent of the sun's UV rays without the need for special UV-blocking lens coatings. Contrast sensitivity testing: What is it? Polycarbonate lenses are made by injection moulding. Polycarbonate has a high price, It is much more expensive than the other plastics or the glass , It is as much as double the price of ABS, So, The customers opt for Acrylonitrile Butadiene Styrene ( ABS ) that is tougher, but it has lower impact resistance and heat resistance. Polycarbonate lenses advantages and disadvantages. Trivex and polycarbonate lenses have sharp central vision. Visual acuity: Is 20/20 (or 6/6) perfect vision? Next, polycarbonate lenses are hard to get scratched. Weight Trivex has a slightly lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. When eye safety is a concern, polycarbonate or Trivex lenses usually are the best choice for your glasses, sunglasses, and sports eyewear. Clarity: A lens that’s optically clearer provides a better picture. However, Trivex is about 10% lighter than polycarbonate. November 14, 2017 November 14, 2017 / The Optical Jedi. Brown eye colour facts: What causes eyes to be brown? They are high-quality, durable lenses which will protect their owner from multiples threats including physical damage and UV radiation. Polycarbonate lenses are highly resistant to impact, won’t shatter, and are 10 times stronger than glass or standard plastic, making them ideal for children, safety lenses, and physical activity. 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