If you've ever been discouraged because you need prescription glasses and prescription sunglasses to accommodate your lifestyle, you should consider photochromic lenses. Photochromic lenses darken when exposed to UV rays. The change is caused by photochromic molecules found throughout the lens or in a coating on the front of the lens. Walk outside, and the lenses darken or tint. Head back indoors and the glasses return to the normal clear lens.T here are a variety of photochromic options available, with choices in color and tint darkness. Ask us if a photochromic lens is a good fit for you!