We can’t live without sunlight for anyone. Sunlight contains a component called ultraviolet light, ultraviolet (UV) is a wavelength of light in the 100 to 400 nanometers (nm). UV light is divided into three types of A, B and C: UV-A is 320 to 400 nm, UV-B is 280 to 320 nm, and UV-C is 100 to 280 nm. UV-A accounts for 97% of the UV light on the earth’s surface, UV -B accounts for 3%, UV-C is mainly absorbed when passing through the atmosphere. The cornea absorbs most UV-A and some UV-B, and the lens and retina absorb some UV-A and UV-B. UV light can cause solar keratitis, cataract, cataract, macular degeneration and age-related macular degeneration. Therefore, it is very important to protect your eyes from the sun. Wearing sunglasses is the most effective protection. Sunglasses doped with metal element oxides can absorb 95% of ultraviolet and infrared rays; polarized sunglasses that polarize light can block out all harmful light without affecting the transmission of visible light, thus effectively protecting the eyes. Sunglasses should be worn all year round, on sunny days, and on cloudy days.