Home > Products > Single Vision Daemyung Optical has various color lenses to keep up with the latest optical fashion. Color : Tinting Brown, Tinting Blue, Tinting Gray Photochromic lenses have an adjustable tint that changes with the amount of available light. In bright sunlight, they darken; indoors, they become clearer. As photochromic lenses darken they reduce glare that can contribute to eye strain.