These sunglasses have photochromic lenses that change color when exposed to sunlight/UV rays. It's difficult to tell from the photos, but the first image shows the clear lenses in their normal state, and the second image shows the lenses with color applied by the photochromic function. They also have blue light blocking capabilities, so they can be used indoors. They are almost new, but I am selling them at a bargain price because I bought new sunglasses.