How can you tell if your sunglasses are UV resistant_

How can you tell if your sunglasses are UV resistant?

Anti-ultraviolet sunglasses are due to a special coating on the lens, and inferior sunglasses not only cannot block ultraviolet rays, but also seriously reduce the light transmittance of the lenses, making the pupils larger, and ultraviolet rays will instead shoot in a large amount and damage the eyes. So Xiao Ke will introduce to you today: how to know if sunglasses are UV-proof. How can you tell if your sunglasses are UV resistant? Method 1: Look at the label of the sunglasses The label or lens of the sunglasses with UV protection can see obvious signs such as "UV protection" and "UV400". The "UV index" is the effect of filtering out ultraviolet rays, which is an important criterion when buying sunglasses. Light with a wavelength of 286nm-400nm is called ultraviolet light, and generally speaking, 100% UV index is impossible, and the UV index of most sunglasses is between 96%-98%. Sunglasses with anti-ultraviolet function generally have the following ways to express it: a) Marked with "UV400": This means that the cut-off wavelength of the lens to ultraviolet is 400nm, that is, the maximum value of its spectral transmittance below the wavelength (位) of 400nm 蟿max (位) is not more than 2%; b) Marked with "UV" and "anti-ultraviolet": this means that the cut-off wavelength of the lens to ultraviolet is 380nm, that is, the maximum value of its spectral transmittance 蟿max(位) below the wavelength (位) of 380nm is not more than 2%; c) Label "100% UV absorption": This means that the lens has 100% UV absorption, that is, its average transmittance in the ultraviolet range is not more than 0.5%. Sunglasses that meet the above requirements are sunglasses that have protection against ultraviolet rays in the true sense. Method 2.Use banknote + money detector pen to verify In the absence of an instrument, ordinary people can also detect whether sunglasses have the function of UV protection. Take a banknote, put the sunglasses lens on the anti-counterfeiting watermark, use a money detector or money detector to take a picture on the lens, if you can still see the watermark, it means that the sunglasses are not UV-proof, if you can't see it, it means that the sunglasses are UV-proof. To sum up the above: Method 2 is a verification of the sunglasses label in Method 1, which can roughly see whether the merchant label is correct and whether the sunglasses have the function of UV protection. When you buy sunglasses, you can try them