u003cbru003eWearing a pair of glasses
when you go out can not only block ultraviolet rays and protect your eyes from damage, but it is also a cool weapon. Whether you are a fashionista or a street hipster, sunglasses are a must-have popular item. However, how many tips do you know about buying sunglasses? First, first observe whether the lenses have scratches, impurities, bubbles, or stripes. Check the outer packaging of the sunglasses. Regular sunglasses should be marked with the name, color, diameter, quality level, The name and trademark of the manufacturer, and the sunglasses with anti-uva, uvb and ce logos on the mirror or tag can ensure that a certain amount of ultraviolet light is blocked. Second, when buying sunglasses, try to see if you feel dizzy or headache. Nowadays, there are some prescription sunglasses for myopia on the market, but because the interpupillary distance and other indicators vary from person to person, consumers should not choose this kind of sunglasses if there is no professional guidance. Third, hold the two corners of the sunglasses against the fluorescent lamp, and let the reflective strip of the mirror roll smoothly. If you find that the fluorescent lamp shadow reflected by the mirror is wavy or twisted, it proves that the lens is not flat, and such a mirror will damage your eyesight. Fourth, the lens should be flat and the transparency should be high. lenses are made of glass and resin, and good sunglasses should use polarized lenses. It is made of synthetic resin, which is as lightweight and precise as contact lenses, and is composed of 7 layers of thin sheets. The outer two layers are super hard wear-resistant layers; the second and sixth layers are anti-shatter and strengthened layers; the third and fifth layers The layer is the ultraviolet filter layer, and the middle layer is the polarized filter layer. Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and have anti-shatter and anti-wear functions. Fifth, in addition to matching the color of sunglasses according to their skin color, face shape, and wearing, they should also be selected according to the place of entry and exit. Generally dark gray is better, dark brown, brown, and black are the next best, blue and purple are inferior, because these two lenses will transmit more ultraviolet rays. Related reading: Sunglasses
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