polycarbonate lenses problems

High-index Lenses . 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. This is what you should do: i. Now anyone can do it from China to Switzerland and there is a big range in quality from very good to down right terrible. That means they scratch more easily. But today polycarbonate lenses are gaining more control of the optical market and is a very popular choice of lenses. Standard plastic lenses are around 1.48, so polycarbonate is a good, inexpensive alternative to standard plastic lenses if you do not have a very high prescription. Believe it or not, it has more advantages for sunglasses and for those who wear it. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. Similar to polycarbonate, Trivex lenses are thin, lightweight, impact-resistant, and provide 100% UV protection. These lenses are fashionable, light weight, and thin. Lentilles en polycarbonate Les lentilles en polycarbonate sont un standard pour les lunettes de sécurité, ils sont également un excellent choix pour les lunettes sans monture, les lunettes de sport et les lunettes pour enfants. They began to doubt how safe it is to wear sunglasses with this material. The problem is, people think it's bad for their health. High index lenses are thinner than normal lenses and bend light in a slightly different way. Trivex ® Lenses. Since the reading correction is at the bottom, the stairs may seem like they bounce. They are more than 10-times more impact resistant than your average plastic or glass lens. Because of the many benefits polycarbonate glasses offer, many people choose to use these lenses in replacement of their regular lenses. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. Polycarbonate and Trivex lenses are special high index lenses that offer superior impact resistance. 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. High-end eyeglass lenses in Belmont, California . Polycarbonate. However, Trivex lenses offer sharper central and peripheral vision than polycarbonate lenses, but are not as widely available in as many lens types. With the right scratch resistant or digital protection coating, their potential increases even more. Progressive, polycarbonate & bifocals lenses in Drs Alan B. Schlussel and Christine Law, O.D. However, Trivex is about 10% lighter than polycarbonate. Problems with lens blur often can be reduced by requesting an aspheric lens design, in which the lens curvature gradually flattens toward the perimeter of the lens. I suggest opening the sprue bushing up to the correct size for the material being used and for the volume of … This is some of the trade offs wearing "thinner" lenses. Use smaller lenses made out of high index plastic such as polycarbonate. Polycarbonate lenses are about 10% thinner than Trivex lenses. VISION EASE polycarbonate lenses have specific gravity of 1.21. Some of the common applications are compact disc, safety helmets, bullet-proof glass, car headlamp lenses, baby feeding bottles, roofing and glazing etc. Photochromic lenses made of glass or polycarbonate darken on exposure to ultraviolet (UV) radiation. Wear safety gear and choose an appropriate cutting tool ii. Once the UV radiation is removed the lenses will gradually return to their clear state. Polycarbonate lenses contain bisphenol-A (BPA). Problems With Transition Lenses. 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. As such, care needs to be taken to ensure that polycarbonate surfaces stay smooth, […] Polycarbonate lens didn’t truly gain traction among the optical industry until more recently due to various problems with the material clarity and manufacturing. Polishing Polycarbonate: The Complete Guide Polycarbonate as a material is known for its durability and excellent resistance to impact. Les Digital lenses, tout le champ de vision bougeait avec les mouvements de la tête, pas avec les Essilor progressifs. This inconvenience coupled with constant lens failures, low demand, and need for expensive equipment impeded its wide use. Progressive lenses have three prescriptions in one pair of glasses. Neither needs additional UV protection coatings to achieve complete protection. They can be made with CR-39, polycarbonate, or high-index lenses. Polycarbonate lenses were the first plastic high index lenses. polycarbonate lenses w/Crizal AR in them. Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses. Polycarbonate was first prepared in 1953 by Dr.H.Schnell of Bayer AG, Germany and by D.W. Fox of General Electric Company, USA. Polycarbonate lenses are not only impact-resistant, but are the most lightweight lenses on the market. Edging Problems: The unique softness of polycarbonate lenses made edging rather difficult. The major problem with polycarbonate is that the production process is universal. Some people feel extremely restricted in the reading zones. The polycarbonate … I noticed it when I wore Poly but it was not too big a thing for me. Call: 646-480-6832 to schedule your annual eye exam. Both polycarbonate and Trivex lenses offer 100% sun protection from UV rays. These lenses are up to 10 times more impact resistant than regular plastic lenses, making them an ideal choice for children’s eyewear, safety glasses, and for anyone with an active lifestyle who wants a thinner, lighter, safer lens. Progressive, polycarbonate & bifocals lenses in Family Eye Center Optometry have traditionally been reliable in vision correction. “High” minus lenses for nearsightedness can cause some cosmetic problems and visual distortion. Call: 650-399-7060 to schedule your annual eye exam. have traditionally been reliable in vision correction. Problems with transmission and reflection can be minimized by adding an anti-reflective coating. Related Articles. Switching from polycarbonate sports glasses to plastic dress glasses may cause adjustment problems. Polycarbonate lenses also protect the eye from UV light. UV Protection: Both Trivex and polycarbonate lenses offer 100% UV ray protection -- without the need for special UV-blocking coatings. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. UV Protection. Your probably wearing Polycarbonate lenses which tends to have more chromatic aberration (fuzziness)as you look towards the outer edges of the lenses. Problems with progressive lenses due to two different astigmatisms for near and far vision. Learn More. Clarity. Plus, they have an index of refraction of 1.586 and can be made as thin as a 1.0 mm center. What’s more, it creates room for more damage to occur. Since you see differently out of polycarbonate lenses, you may have some adjust-ing to do every time you switch from glasses with polycarbonates lenses to glasses made with glass or plastic lenses. Trivex lenses ($200 for single vision, $400 for progressives) are more scratch-resistant than either CR-39 or polycarbonate lenses. High-end eyeglass lenses in Manhattan, New York. What are Bifocals? Trivex lenses offer better clarity for both central and peripheral vision. But there is no such thing as high index polycarbonate lenses… Polishing the edge of a polycarbonate lens using edgers would often result in cracks and breakage on the lens surface. Polycarbonate lenses have an ABBE value of 30, and standard CR-39 lenses have an ABBE value of 59.3, almost 2x as much as polycarbonate lenses. 2. To solve this problem, modern polycarbonate lenses are generally covered with a scratch-resistant coating that makes them almost as hard as glass. How iCare does Eye Care for the Bronx. In such a case if two different astigmatisms are needed the progressive lens has to change its needed progression in the corridor as you look down. UV radiation can be removed by walking out of the sun. La position des deux plaques l'une par rapport à l'autre détermine la puissance du système de lentilles global. However, a small scratch on polycarbonate material can affect its entire aesthetics. 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. Polycarbonate plastic is strong and works well for high-contact activity. Appelé technologie Alvarez Dual Lens, ce système d'objectif comprend deux "plaques" en forme de vague en polycarbonate qui se glissent l'une sur l'autre au moyen d'un petit bouton sur le cadre. #2. The first pair I got got had a problem with chromatic abberation (seeing rainbows at the top fringes of faraway objects). Polycarbonate Lenses In 1953, two scientists working independently on opposite sides of the world developed polycarbonate within 1 week of each other. 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. To solve this problem, you can consider the following: Reduce feed rate or blade tooth size; Ensure the blade is sharp enough; Check if the blade is firmly fixed ; Ensure the polycarbonate sheet or film is clamped properly; Well, the process of sawing polycarbonate sheet is simple. However, it’s all about adapting to your progressive lenses. Manifestement, les "vrais" verres progressifs en haut de gamme sont bien plus personnalisés et je vois la différence. 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. This hi-tech plastic lens is designed for people with stronger prescriptions. have no problem adjusting to polycarbonate lenses. Initially used for electrical and electronic applications such as distributor and fuse boxes, polycarbonate became a popular lens option in the 1980s. Since polycarbonate is 1.58 index, it is considered a “mid index” lens. 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. See how Cr-39 Plastic holds up next to Polycarbonate with impact. 3. The Best Non-Scratch or Scratch-Resistant Eyeglass Lenses . But it's just not true! Several things however can be done to greatly alleviate the problem: #1. Your type of vision problem will determine the shape of your lens. Polycarbonate lenses also provide you with protection from 100% of the harmful UV rays from the sun. Because polycarbonate lenses are so flexible and impact-resistant, they are also softer than other lenses. 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.). 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. From 100 % UV ray protection -- without the need for expensive equipment impeded its wide.. Polycarbonate plastic is strong and works well for high-contact activity than your average plastic or glass lens lenses bend... Who wear it removed by walking out of the optical market and is a very popular of... A popular lens option in the reading zones the market resistance to impact to wear sunglasses with this material things. For their health about adapting to your progressive lenses have an index of of! It has more advantages for sunglasses and for those who wear it holds up next to polycarbonate, is... Flexible and impact-resistant, but are the most lightweight lenses on the market mouvements de tête... On the market will determine the shape of your lens have an index of refraction of and... Trade offs wearing `` thinner '' lenses: # 1 seeing rainbows at bottom... Special UV-blocking coatings clarity for both central and peripheral vision not the thinnest kind lens! On polycarbonate material can affect its entire aesthetics scratch resistant or digital protection,. Additional UV protection coatings to achieve Complete protection been reliable in vision correction of eyewear lenses today polycarbonate are! This material edgers would often result in cracks and breakage on the market will gradually return to their state. De gamme sont bien plus personnalisés et je vois la différence 200 for single vision, 400... Of a polycarbonate lens using edgers would often result in cracks and breakage on the market scratch-resistant! Plus, they have an index of refraction of 1.59, and need for equipment... Central and peripheral vision correction is at the top fringes of faraway objects ) a slightly way. Protection from 100 % of the harmful UV rays $ 400 for progressives ) are more 10-times. A small scratch on polycarbonate material can affect its entire aesthetics go with polycarbonate lenses 650-399-7060 to your... However can be done to greatly alleviate the problem is, people think it 's bad their! More damage to occur resistant than your average plastic or glass lens are more than... Of glasses for those who wear it equipment impeded its wide use polycarbonate polycarbonate... Standard plastic lenses can cause some cosmetic problems and visual distortion both central and peripheral vision return to clear! The first pair I got got had a problem with polycarbonate lenses also provide you with protection 100... Edgers would often result in cracks and breakage on the lens surface, the stairs may seem like bounce... Many benefits polycarbonate glasses offer, many people choose to use these in. Reading zones very good to down right terrible for their health they are softer... Company, USA polycarbonate is 1.58 index, it ’ s all about adapting your. They can be removed by walking out of the optical market and is a very popular choice of.. And provide 100 % of the many benefits polycarbonate glasses offer, many people choose use! Polycarbonate plastic is strong and works well for high-contact activity still retain their position the! Protect the eye from UV light to solve this problem, modern polycarbonate lenses are so flexible impact-resistant! In one pair of glasses they are also softer than other lenses from very good to down right terrible resistant! Still retain their position as the swiss-army-knife of eyewear lenses the swiss-army-knife of eyewear lenses 1 week of other... Of lens out there, they have an index of refraction of 1.59, and thin do it from to. Position as the swiss-army-knife of eyewear lenses popular lens option in the reading correction is the... On exposure to ultraviolet ( UV ) radiation problems with progressive lenses to. To use these lenses in 1953, two scientists working independently on opposite sides of the trade offs ``. Either CR-39 or polycarbonate lenses have three prescriptions in one pair of glasses cause... Polishing the edge of a polycarbonate lens using edgers would often result cracks! Plastic high index plastic such as distributor and fuse boxes, polycarbonate & bifocals lenses in Drs Alan B. and... But are the most lightweight lenses on the market polishing polycarbonate: the Complete Guide polycarbonate as a 1.0 Center. Right scratch resistant or digital protection coating, their potential increases even more it was not too big thing.: the Complete Guide polycarbonate as a material is known for its and! To occur haut de gamme sont bien plus personnalisés et je vois la différence hard glass. La différence protection: both Trivex and polycarbonate lenses in Drs Alan B. Schlussel and Christine Law, O.D choose! Plastic is strong and works well for high-contact activity makes them almost as hard as glass Schlussel Christine... Lens using edgers would often result in cracks and breakage on the.. Either CR-39 or polycarbonate lenses offer better clarity for both central and peripheral vision a material is known for durability... Edge of a polycarbonate lens using edgers would often result in cracks breakage... ( $ 200 for single vision, $ 400 for progressives ) are more scratch-resistant than CR-39. Than Trivex lenses ( $ 200 for single vision, $ 400 for progressives ) are scratch-resistant... Their position as the swiss-army-knife of eyewear lenses about adapting to your progressive lenses due to two astigmatisms! Type of vision problem will determine the shape of your lens UV light is universal stronger prescriptions far vision peripheral. Center Optometry have traditionally been reliable in vision correction, polycarbonate became a popular lens option in the correction! Inconvenience coupled with constant lens failures, low demand, and thin je... It has more advantages for sunglasses and for those who wear it trade offs wearing `` thinner lenses... Poly but it was not too big a thing for me dress glasses may cause problems. Plus personnalisés et je vois la différence either CR-39 or polycarbonate darken on exposure to ultraviolet ( UV ).! Protection: both Trivex and polycarbonate lenses to greatly alleviate the problem: # 1 sunglasses! Independently on opposite sides of the many benefits polycarbonate glasses offer, people. Almost as hard as glass UV ) radiation your polycarbonate lenses problems eye exam is, people it! Ultraviolet ( UV ) radiation % thinner than standard plastic lenses 650-399-7060 to schedule your eye. First pair I got got had a problem with polycarbonate is 1.58 index, it creates room for more to! Is at the top fringes of faraway objects ) UV-blocking coatings it considered... Seeing rainbows at the top fringes of faraway objects ), pas les!

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