What are photochromic lenses?Photochromic lenses are also referred to as light-sensitive lenses";. Gla lenses are adding silver halide, but now is the mainstream of photochromic resin lenses, adding of spiro and other chemicals in the acrylic resin lens, so that the original colorle and transparent lenses, in bright light, will become colored lenses, to do the protection, so is suitable for indoor and outdoor use. Photochromic lens optical gla containing silver halide microcrystals, phototropy reversible reaction according to the principle, in the sunlight and UV irradiation variable dark, completely absorb ultraviolet and visible light absorption of neutral; back to the dark, can restore the colorle transparent. Photochromic lenses are mainly used in open-air fields, snow fields and indoor light sources, so as to prevent sunlight and ultraviolet light from damaging the eyes.Warm tips1.Please correctly understand photochromic glaes, he color depth does not equal sunglaes2.Test discoloration, it is recommended to test at noon, noon sun UV strong, discoloration can achieve the best results, more test several times, the effect is better.BlackBrownBlueGray