What is the UV index of sunglasses

u003cbru003eUV index: For sunglasses, the UV index is to filter out the effect of ultraviolet rays, which should eliminate the 280-400nm light. At present, the UV index of most sunglasses is between 96% and 98%, and dark lenses are better than light lenses. Ultraviolet rays account for 5% of all the sun's rays hitting the surface of the earth. Ultraviolet rays are harmful to human skin and eyes. Among them, UV-B ultraviolet rays with wavelengths between 280 and 320 microns can cause keratitis and skin cancer, and UV-C ultraviolet rays with wavelengths between 320 and 380 can make people vulnerable to cataracts and retinal burns. Sunglasses with the UV-400 logo indicate that they can filter out harmful light within a wavelength of 400 microns, and can block more than 98% of the ultraviolet rays from the human eyes, so they have a better protective effect. The amount of blocking light depends on the color of the lens. The darker the color, the more the light is blocked. The UV is blocked. When the processed lens is in a liquid state, the raw material that absorbs UV is added to block the UV. Normal sunglasses are 100%. UV-proof is that of UV400. Ordinary optical resin lenses are generally UV-resistant 360-380, unless otherwise specified, they are protected against UV400. Related reading: Sunglasses and glasses

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