Our company mainly produces 1.56 photochromic lens(grey,brown). .The lens is suitable for businessman & office lady. Meanwhile can replace sunglasses, and fits all the people. UV Protection.Photochromic lens changing and fading speed are much faster than most other lenses,The color of photochromic lenses will darken when exposed to sun or ultra-violet light. And it is clear when staying away from this kind of light sources. Wearing photochromic lenses is comfortable and beautiful. They can be used as sunglasses and as therapy glasses.The price is reasonable and competitive.