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Sunglasses of this type are sometimes called mirrorshades. A mirror coating does not get hot in sunlight and it prevents scattering of rays in the lens bulk. Sunglass lenses are made of either glass, plastic, or SR-91. Plastic lenses are typically made from acrylic, polycarbonate, CR-39 or polyurethane. Glass lenses have the best optical ...
CR-39 is about half the weight of glass with an index of refraction only slightly lower than that of crown glass, and its high Abbe number yields low chromatic aberration, altogether making it an advantageous material for eyeglasses and sunglasses. A wide range of colors can be achieved by dyeing of the surface or the bulk of the material.
Safilo Group S.p.A. (acronym of Società Azionaria Fabbrica Italiana Lavorazione Occhiali) is an Italian company that designs, produces, and distributes prescription frames, sunglasses, sports eyewear, ski goggles and helmets, and cycling helmets under its own five house brands and 32 licensed brands, including Smith Optics since 1996.
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Pearle Vision is an American chain of eye care stores. It is one of the largest franchised optical retailers in North America. The company was acquired by Luxottica (which has since merged with Essilor to form EssilorLuxottica), [2] an Italian eyewear company, in 2004.
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