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A material that is made of a composite of multiple resins. Although heavier by weight over plastic and polycarbonate because of it's density, the lens can be made thinner, therefore making the overall lens "lighter" as well as much thinner. Because of the higher density of material, there is a higher surface reflection. An anti reflective treatment can counter this effect and is strongly recommended for this material. Lenses come with front side scratch protection on all purchases. One year warranty on lens purchase. Want to extend your warranty to two years? Add our premium anti reflective options for fantastic clarity and scratch protection. Premium anti reflectives also offer easy to clean surfaces.
Photochromatic Lenses and how they work
Lenses that change when you go outdoors! This type of lens is by far one of the most popular features requested by customers. The lens is clear indoors and turns dark outdoors. For some people this is a great option over having separate pairs of indoor glasses and separate sunglasses. Today's technology is vastly improved over photochromatics of even 3 to 4 years ago.
Photochromic lenses have millions of molecules of substances such as silver chloride or silver halide embedded in them. The molecules are transparent to visible light in the absence of UV light, which is normal for artificial lighting. But when exposed to UV rays, as in direct sunlight, the molecules undergo a chemical process that causes them to change shape. The new molecular structure absorbs portions of the visible light, causing the lenses to darken. The number of molecules that change shape varies with the intensity of the UV rays.
When you go indoors and out of the UV light, a different chemical reaction takes place. The absence of the UV radiation causes the molecules to "snap back" to their original shape, resulting in the loss of their light absorbing properties. In both directions, the entire process happens very rapidly.
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