What are the most common materials used in prescription lenses?
Lenses produced from plastic resins and polymers are by far the most popular choice in eyewear today. They offer equal vision with increased comfort due to their light weight. They also allow for a greater choice of frames since plastics are available in larger size lenses than glass. Due to the delicate nature of the plastic surface, a scratch resistant coating is always a worthwhile investment. Glass There are two common types of glass used. One is clear glass referred to as Crown glass. The other is a photochromic glass. A chemical added to the glass when in liquid form, will cause a reaction with Ultraviolet Rays. The reaction results in darkening the lens, thus producing a lens that is clear indoors and a sunglass outdoors. Two colors are commonly produced, grey and brown. Ultra thin lenses Ultra thin lenses are achieved by the combination of a denser material and a flatter surface on the front side of the lenses. This usually results in lenses, which are approximately 25% thinner
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