The original Ray-Ban aviators used a lens tint called G-15, which is a blend of gray and green. It’s still considered one of the best lens tints for all-around use and clear color perception (which is why it’s still a favorite for pilots.) There are some other shades that have specific uses — for instance, yellow glasses increase contrast, reduce haze, and work well in low light, making them popular for night driving and target sports. Rose or brown tints work well for golfers, as they allow good contrast on the green.