Photochromic lenses react to different lighting situations. They are clear when you are indoors or at night. They change into a dark sunglass lens when you are outdoors in the sunlight.
Photochromic lenses are like sunblock for your eyes. They filter and block 100% UVA and UVB rays from the sun.
The premium brand of photochromic lenses that our optical uses is Transitions.
Transitions lenses are available in Gray or Brown.