u003cbru003eEveryone knows that one of the rays emitted by the sun is ultraviolet rays. Frequent ultraviolet rays are actually harmful to the human body. The common thing is that the skin will deteriorate and turn black, and of course it is also harmful to the eyes. At this time, we need a pair of anti-UV
glasses, so what are anti-UV glasses? Ray-Ban RB3449 Men's
Sunglasses Silver/Lens Colorful Blue 004/55 UV Protection Glasses are actually a kind of
sunglasses, but they have UV protection. So how do you know if
sunglasses have this function? There are two small methods. Method 1. Look at the label of the sunglasses. You can see obvious signs such as 'UV' and 'UV400' on the label or lens of the sunglasses. 'UV index' is the effect of filtering out ultraviolet rays, which is an important criterion for buying sunglasses. Light with a wavelength of 286nm-400nm is called ultraviolet light. Generally speaking, 100% UV index is impossible. The UV index of most sunglasses is between 96% and 98%. Sunglasses with anti-ultraviolet function generally have the following explicit indications: a) Mark 'UV400': This means that the cut-off wavelength of the lens for ultraviolet is 400nm, that is, the maximum value of the spectral transmittance at the wavelength (λ) below 400nm τmax(λ) is not greater than 2%; b) Mark “UV” and “UV protection”: This means that the cut-off wavelength of the lens to ultraviolet is 380nm, that is, the maximum value τmax of the spectral transmittance at the wavelength (λ) below 380nm (λ) Not more than 2%; c) Mark '100% UV absorption': This means that the lens has the function of 100% absorption of ultraviolet rays, 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 a real protection function against ultraviolet rays. Method 2. Use banknotes and money detector pens to verify that ordinary people can also detect whether the sunglasses have UV protection. Take a banknote, put the sunglasses lens on the anti-counterfeiting watermark, and take a photo on the lens with a money detector or a money detector. If you can still see the watermark, it means that the sunglasses are not UV resistant. If you can’t see it, it means This pair of sunglasses is UV resistant. Ray-Ban RB4225 Men's Sunglasses 646/55 Transparent. Many friends would think, is it really effective to wear anti-UV sunglasses? The answer is yes. Although ultraviolet light helps the body to absorb calcium, too much ultraviolet light can easily cause rough skin and cause skin cancer. The eyes are a very fragile place and are more vulnerable to damage. UV-proof glasses can be used as a protection The hood protects the eyes from UV rays. The above information is compiled by the editor. For more knowledge of fashionable sunglasses, please see related articles! Related Reading: Sunglasses Polarized Sunglasses
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