In life, there are too many light sources will produce harmful light, especially the sun; There are three kinds of light emitted from sunlight: visible light, infrared light and Ultraviolet light. Among them, ultraviolet light causes serious damage to human skin and eyes. Above, Visible light ray (310~780nm); Ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, Blue light, among which UVA, UVB, UVC are harmful rays. If exposed to the sun for a long time, they will cause damage to the body. UVB has a serious impact on vision, and Tanning Ray is the light that burns black skin. Most corners of the eye absorb this UVB light, so be sure to block it out. Polarized sunglasses because it has the function of polarizing light, so it can block all the harmful light but does not affect the transmission of visual light, can really achieve the function of protecting the eyes. Polarized sunglasses in addition to the basic UV protection function, but also anti-glare, road reflection light, water scale light, etc., suitable for driving, fishing, tourism, daily wear.