Ray-Ban Round Blue-Light Clear Evolve sunglasses with a grey lens color are a must-have for those seeking both style and substance. This metal round frame with gold mirror lenses is designed to optimize your vision. The blue-violet light filter helps reduce exposure to blue-violet light* indoors and outdoors (sun being primary source), while the grey lenses offer a layer of protection from UV rays.*Blue-violet light is between 400 and 455nm as stated by ISO TR20772 2018.