'Eight Attentions' for Sunglasses Purchase

u003cbru003eThe temperature gradually rises in spring and summer, and cumbersome accessories and accessories will make men feel cumbersome. At this time, a pair of beautiful and eye-protecting sunglasses will undoubtedly become a cool choice for fashionable men. Although sunglasses have decorative functions, their protective functions are important. If you can’t block UV light properly, it will cause damage to your eyes for a long time, so pay special attention to the following points when buying sunglasses. First, observe whether the lens has scratches, impurities, bubbles, or streaks. Check the outer packaging of the sunglasses. Regular sunglasses should be marked with the name, color, diameter, quality level, manufacturer name and trademark. Only UVA, UVB and CE-marked sunglasses can ensure a certain level of UV protection. 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, use the two corners of the sunglasses to face 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. 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. 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 shatter-resistant 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, the color of sunglasses should not only be matched according to their skin color, face shape and wearing, but also 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. Gray lenses can absorb any color spectrum in a balanced manner, and the scene seen after wearing the lenses will only darken without obvious chromatic aberration; brown lenses can filter out a large amount of blue light, which can improve visual contrast and clarity. In severe air pollution or The wearing effect is particularly good under foggy conditions, and it can block the reflected light from the smooth and bright surface of the object. Wearing glasses can see the subtle parts clearly, which is the driver’s choice; the dark green lens absorbs heat and brings a cool feeling, but transmits light The degree and clarity are low, suitable for wearing in the sun, but not when driving; try not to use yellow, orange and light red. It is better to choose products that are 100% UV resistant on the label. Consumers should give full consideration to manufacturing costs, sales services and other links. The quality of sunglasses worth twenty or thirty yuan is often not guaranteed. Go to a larger spectacle store or a spectacle counter in a big shopping mall to buy, generally you can get a better guarantee in terms of quality inspection and sanitary inspection. Sixth, the color depth of sunglasses lenses is divided into 15%, 34%, 50%, and 70%. 15% can be worn indoors and outdoors; 34% are suitable for ordinary outdoor environments; 50% are suitable for hot sun and seaside; 70% are for special purposes such as electric welding. How to choose the shade of sunglasses? The simple self-test method is to wear sunglasses in front of the mirror, so that you can see your pupils as the limit. If the color is too light, the filtering effect is too small; if the color is too dark, the vision will be affected and the color perception will be weakened. This year’s popular colorful light-colored sunglasses should not be used for beach water activities and under the sun with very strong sunlight, but sports sunglasses, which can absorb or reflect more visible light. Seventh, wearing sunglasses is not only to reduce strong light stimulation and make the eyes comfortable, but the main purpose is to prevent ultraviolet rays from damaging the eyes. The color of the lens and whether it is UV-resistant are two different things. Even if the color of the lens is dark, it may not be effective against UV, so it must be Choose lenses that are marked with UV protection. Usually the UV index of sunglasses is between 96% and 98%. Eighth, in general, regular eyeglass shops will have equipment to detect the ability of sunglasses to resist ultraviolet rays. Through this test, you can know whether the glasses in your hand are helpful to your eye health.
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