Points to remember when choosing sunglasses

u003cbru003ePoor quality sunglasses are unclear and cannot withstand ultraviolet rays. As a result, the pupils are enlarged and the lens of the eye can absorb more ultraviolet rays. Therefore, you must choose a reputable store to buy. So what should I pay attention to when buying sunglasses? First, first observe whether the lens has scratches, impurities, bubbles, or streaks, and check the outer packaging of the sunglasses. The formal sunglasses should be marked with the name, color, diameter, quality level, manufacturer name and trademark, and the mirror or tag has an indication Sunglasses with anti-UVA, UVB and CE marks can ensure a certain level of UV protection. Second, when buying sunglasses, try to see if you feel dizzy or headache. There are also some prescription sunglasses on the market, but because the interpupillary distance and other indicators vary from person to person, consumers should not choose this kind of prescription sunglasses without professional guidance. Third, hold the two corners of the sunglasses against the fluorescent lamp with your hand, 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, and good sunglasses should use polarized lenses. It is made of synthetic resin that is as lightweight and precise as contact lenses, composed of seven 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 are ultraviolet filters The middle layer is the polarizing filter layer. Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and have anti-shatter and anti-wear functions. They are popular sunglasses. 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 speaking, black, brown, and gray filter effects are good; gray lenses can absorb any color spectrum evenly, and the scene seen after wearing the glasses will only darken without obvious chromatic aberration; brown lenses can filter out a lot Blue light can improve visual contrast and clarity, and is particularly effective when worn under severe air pollution or fog. Sixth, what shade of color suits us? 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, don’t use them in beach water activities, in the snow with strong reflections, and in the sun with very strong sunlight. Instead, wear sports sunglasses. Most of them use bright saturated colors that can absorb or Reflects more visible light. Seventh, in addition to reducing strong light stimulation and making the eyes comfortable, wearing sunglasses is mainly 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 able to effectively prevent UV, so Be sure to choose lenses marked with UV protection. Usually the UV index of sunglasses is between 96%-98%.
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