Polycarbonate lenses have a moderate price and are thinner, lighter, ... One of the few progressive lens disadvantages it that there are occasionally problems with HD progressive lenses when walking up and downstairs. These lenses are fashionable, light weight, and thin. Trivex lenses ($200 for single vision, $400 for progressives) are more scratch-resistant than either CR-39 or polycarbonate lenses. Similar to polycarbonate, Trivex lenses are thin, lightweight, impact-resistant, and provide 100% UV protection. Learn More. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. Polishing Polycarbonate: The Complete Guide Polycarbonate as a material is known for its durability and excellent resistance to impact. To solve this problem, modern polycarbonate lenses are generally covered with a scratch-resistant coating that makes them almost as hard as glass. What are Bifocals? have no problem adjusting to polycarbonate lenses. How iCare does Eye Care for the Bronx. Progressive, polycarbonate & bifocals lenses in Family Eye Center Optometry have traditionally been reliable in vision correction. Use smaller lenses made out of high index plastic such as polycarbonate. Polycarbonate lenses were the first plastic high index lenses. En portant des lunettes de sport de prescription avec des lentilles en polycarbonate résistant aux chocs, vous pouvez réduire considérablement le risque de subir une abrasion cornéenne douloureuse ou d'autres blessures aux yeux pendant les sports actifs. I noticed it when I wore Poly but it was not too big a thing for me. This is what you should do: i. I suggest opening the sprue bushing up to the correct size for the material being used and for the volume of … The major problem with polycarbonate is that the production process is universal. Your type of vision problem will determine the shape of your lens. Optical Clarity: All lenses are given an Abbe number which describes the amount of chromatic aberration (which describes the occurrence of problems such as distorted or blurred images) of an optical lens. See how Cr-39 Plastic holds up next to Polycarbonate with impact. This polycarbonate part presented cosmetic problems for the molder, inside each gate, down the side of the part, and at the end-of-fill weld lines. Polycarbonate lenses also provide you with protection from 100% of the harmful UV rays from the sun. The Best Non-Scratch or Scratch-Resistant Eyeglass Lenses . Polycarbonate lenses are about 10% thinner than Trivex lenses. But it's just not true! They can be made with CR-39, polycarbonate, or high-index lenses. Call: 650-399-7060 to schedule your annual eye exam. Initially used for electrical and electronic applications such as distributor and fuse boxes, polycarbonate became a popular lens option in the 1980s. The polycarbonate … They began to doubt how safe it is to wear sunglasses with this material. #2. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. Wear safety gear and choose an appropriate cutting tool ii. have traditionally been reliable in vision correction. Since polycarbonate is 1.58 index, it is considered a “mid index” lens. Problems with transmission and reflection can be minimized by adding an anti-reflective coating. Polycarbonate lenses are not only impact-resistant, but are the most lightweight lenses on the market. Your probably wearing Polycarbonate lenses which tends to have more chromatic aberration (fuzziness)as you look towards the outer edges of the lenses. Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses. Polycarbonate lenses also protect the eye from UV light. Believe it or not, it has more advantages for sunglasses and for those who wear it. This inconvenience coupled with constant lens failures, low demand, and need for expensive equipment impeded its wide use. Polarized lenses are also made of plastic, but they also contain a special filter that prevents "intense reflected light, reducing glare," according to All About Vision. Our polycarbonate lenses are manufactured with proprietary, fourth-generation water-white polycarbonate resins, are up to 50% lighter and thinner than plastic alternatives and 10 times more impact-resistant. Polycarbonate and Trivex lenses are special high index lenses that offer superior impact resistance. As such, care needs to be taken to ensure that polycarbonate surfaces stay smooth, […] Photochromic lenses made of glass or polycarbonate darken on exposure to ultraviolet (UV) radiation. Edging Problems: The unique softness of polycarbonate lenses made edging rather difficult. Clarity. UV Protection: Both Trivex and polycarbonate lenses offer 100% UV ray protection -- without the need for special UV-blocking coatings. Many kinds of lenses are manufactured from polycarbonate, including automotive headlamp lenses, lighting lenses, sunglass/eyeglass lenses, swimming goggles and SCUBA masks, and safety glasses/goggles/visors including visors in sporting helmets/masks and police riot gear (helmet visors, riot shields, etc.). Because of the many benefits polycarbonate glasses offer, many people choose to use these lenses in replacement of their regular lenses. Problems with progressive lenses due to two different astigmatisms for near and far vision. Because polycarbonate lenses are so flexible and impact-resistant, they are also softer than other lenses. Progressive, polycarbonate & bifocals lenses in Drs Alan B. Schlussel and Christine Law, O.D. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. Trivex ® Lenses. Quand j'ai eu des Zeiss Digital Lenses (le même genre de produit), ça a été pareil, mesure d'écart pupillaire, hauteur de montage et c'est tout. 2. Problems With Transition Lenses. Les Digital lenses, tout le champ de vision bougeait avec les mouvements de la tête, pas avec les Essilor progressifs. Polycarbonate was first prepared in 1953 by Dr.H.Schnell of Bayer AG, Germany and by D.W. Fox of General Electric Company, USA. High index lenses are thinner than normal lenses and bend light in a slightly different way. After discovering this I was immediately convinced that this was my problem, and I was very angry with Lenscrafters for pushing the Polycarbonate lenses on me, and making plastic lenses seeming like they were an inferior product. However, Trivex is about 10% lighter than polycarbonate. Uv ) radiation polycarbonate lenses are thin, lightweight, impact-resistant, and provide 100 % sun protection UV! 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