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glasses are common and practical in our daily life, but some common sense about
sunglasses is not known to everyone who wears
sunglasses, such as what kind of
sunglasses lens is good and what color should be chosen for the lens UV protection and so on. Some people think that the darker the color of the sunglasses, the better the UV protection, so is it true? Many people think that the depth of the lens color is directly proportional to the UV protection performance, but in fact there is no relationship between the two, because the color depth of the lens refers to the transmittance of visible light, which can be judged by the naked eye, while the ultraviolet light cannot be judged by the naked eye. Observed, the anti-ultraviolet performance of the lens can only be detected by a specific focal meter and spectrum analyzer. For example, the PC lens with anti-reflection coating has a light transmittance of 99%, but the anti-ultraviolet performance is almost reached. 100%. If the lens does not protect against ultraviolet rays, the darker the lens color, the greater the damage to the eyes, because wearing dark sunglasses in the sun will cause the pupils to dilate due to the reflection of light, and the lens itself cannot prevent the penetration of ultraviolet rays, so per unit area The amount of ultraviolet rays has not decreased, but the pupil area that receives light has increased. Therefore, the amount of ultraviolet rays entering the eyes has increased. That is to say, wearing dark sunglasses that are not UV resistant is more harmful to the eyes than wearing sunglasses. Related Reading: Sunglasses Polarized Sunglasses
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