Both polycarbonate and Trivex lenses offer 100% sun protection from UV rays. Several things however can be done to greatly alleviate the problem: #1. The Best Non-Scratch or Scratch-Resistant Eyeglass Lenses . Call: 650-399-7060 to schedule your annual eye exam. Wear safety gear and choose an appropriate cutting tool ii. Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses. 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. Neither needs additional UV protection coatings to achieve complete protection. The first pair I got got had a problem with chromatic abberation (seeing rainbows at the top fringes of faraway objects). As such, care needs to be taken to ensure that polycarbonate surfaces stay smooth, […] Polycarbonate lenses were the first plastic high index lenses. 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. This hi-tech plastic lens is designed for people with stronger prescriptions. Clarity. Polycarbonate lenses also provide you with protection from 100% of the harmful UV rays from the sun. However, a small scratch on polycarbonate material can affect its entire aesthetics. The problem is, people think it's bad for their health. What’s more, it creates room for more damage to occur. Polycarbonate lenses are ultra-durable, ultra-lightweight lenses. However, it’s all about adapting to your progressive lenses. They began to doubt how safe it is to wear sunglasses with this material. See how Cr-39 Plastic holds up next to Polycarbonate with impact. 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. They can be made with CR-39, polycarbonate, or high-index lenses. The polycarbonate … To solve this problem, modern polycarbonate lenses are generally covered with a scratch-resistant coating that makes them almost as hard as glass. Use smaller lenses made out of high index plastic such as polycarbonate. Problems With Transition Lenses. They are more than 10-times more impact resistant than your average plastic or glass lens. Progressive, polycarbonate & bifocals lenses in Drs Alan B. Schlussel and Christine Law, O.D. 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. Because of the many benefits polycarbonate glasses offer, many people choose to use these lenses in replacement of their regular lenses. Progressive lenses have three prescriptions in one pair of glasses. Plus, they have an index of refraction of 1.586 and can be made as thin as a 1.0 mm center. #2. Polycarbonate. Polycarbonate lenses are about 10% thinner than Trivex lenses. Believe it or not, it has more advantages for sunglasses and for those who wear it. UV Protection: Both Trivex and polycarbonate lenses offer 100% UV ray protection -- without the need for special UV-blocking coatings. 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. The major problem with polycarbonate is that the production process is universal. Some of the common applications are compact disc, safety helmets, bullet-proof glass, car headlamp lenses, baby feeding bottles, roofing and glazing etc. These lenses are fashionable, light weight, and thin. Since the reading correction is at the bottom, the stairs may seem like they bounce. Manifestement, les "vrais" verres progressifs en haut de gamme sont bien plus personnalisés et je vois la différence. 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. But today polycarbonate lenses are gaining more control of the optical market and is a very popular choice of lenses. 2. have traditionally been reliable in vision correction. Once the UV radiation is removed the lenses will gradually return to their clear state. 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. I generally recommended people with prescriptions anywhere between +/-0.50 to +/-4.00 to go with polycarbonate lenses. 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. That means they scratch more easily. 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. However, Trivex is about 10% lighter than polycarbonate. Since polycarbonate is 1.58 index, it is considered a “mid index” lens. 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