“Color is a matter of personal preference, and the intensity of the color—whether it’s brown, green, or gray—doesn’t matter because it’s the absorption of ultraviolet light rays that protects you, not the color or darkness of the lens. You can even have clear lenses that protect you from UVA/UVB.
“Gray and green are pretty neutral, so they’re not going to change the colors you see. Psychologically, people think more light comes through brown lenses because they make colors warmer. I think they make sunsets prettier because you get more on the red end in a brown lens than you do with a gray lens.
“Some people think mirrored lenses are just fashion, but mirrored sunglasses reflect and block light, so that’s why they’re even darker.
“Polarized lenses remove reflected light off of a flat surface. When you go to the beach, you get a glare because the ocean is flat or when you’re driving, glares also come off other cars, road surfaces, and store windows. Polarization doesn’t offer you any greater light protection; it just reduces glare. But there is a thing about it: You can’t look at your cell phone with polarized lenses, because it’ll be black. You have to turn your phone 35 degrees to be able to see it.”