As technology advances, so do lenses . In the past, they were made exclusively of glass. Today, most are made of high-tech plastics. These new ones are lighter, don’t break as easily as glass, and can be treated with a filter to shield your eyes from damaging ultraviolet (UV) light. The following lenses are lighter, thinner, and more scratch-resistant than glass or the older plastic types. X-SUNZ Sunglasses Lens Consist of two types. Polycarbonate Polycarbonate lenses are up to 10 times more impact-resistant than plastic or glass lenses and they provide 100% protection from the sun's harmful UV rays. They are also lightweight, adding to the comfort of your eyeglasses , sunglasses , and sports eyewear. Polarized Polarized sunglasses have been popular since 2004, we have started to promote this glasses since 2001. But now that many others who spend time outdoors have discovered the benefits of polarized lenses, ...