What color is good for choosing sunglasses?

　　Generally, gray, green, and brown are preferred

　　In addition to protecting the eyes, qualified sunglasses can also prevent the skin around the eyes from being attacked by ultraviolet rays and slow down aging. But is it true that darker the sunglasses, the more they block the sun's damage to the eyes?

　　The eyes are the most sensitive part of the body to ultraviolet rays. If the eye is stimulated by ultraviolet rays for a long time, it can damage the cornea, lens, retina and other tissues, resulting in corneal endothelial damage, solar keratitis, ultraviolet cataract, macular degeneration and other eye diseases.

　　Therefore, the most important purpose of wearing sunglasses should be to reduce the damage of ultraviolet rays to the eyes. Inferior sunglasses or some high-imitation sunglasses often do not have the ability to block ultraviolet rays, because the reason why sunglasses can block ultraviolet rays is that a special coating is added to the lens. Sunglasses that do not block ultraviolet rays, due to a certain degree of shading, the pupils will become larger when the light stimulation is not strong, and it is easy for the unblocked ultraviolet rays to invade directly, causing greater damage than not wearing sunglasses. It is recommended that when buying sunglasses, you can pay attention to whether there are "UV protection" and "UV400" logos on the product label. Sunglasses aren't always darker or better. Different colors of lenses have different functions, generally gray, green, brown is better, the color is not dark or light.