Transition glasses, also called photochromic lenses ... prescription sunglasses if you are going to be on a boat or near water. While prescription sunglasses give you the chance to expand your ...

The result of the chemical reaction is a color change in the lens. The very first photochromic lenses were made of glass and coated with silver chloride and silver halide, among other molecules.

People who wear glasses know the hassle of swapping back and forth between regular prescription eyeglasses and prescription sunglasses, which is why many people may consider transition lenses instead.