In life, there are too many light sources that can produce harmful light, especially sunlight; the light emitted from the sunlight includes three types: visible light, infrared rays, and ultraviolet rays (Ultraviolet). Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.; among the rays released by sunlight, IR (Infra-red) infrared rays (750nm) and above, visible light ray (310~780nm); Ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, blue light (Blue light) of which UVA, UVB, UVC are harmful rays, if long-term exposure will cause damage to the body, UVB has a serious impact on vision, ( Tanning Ray) is the light that burns the skin. Most of the corners of the eyes will absorb this UVB light, so this light source must be blocked. Polarized sunglasses have the function of polarizing light, so they can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes. In addition to the basic anti-ultraviolet function, polarized sunglasses also have anti-glare, road reflections, water scales, etc., suitable for driving, fishing, traveling, and daily wear.