u003cbru003eIn the previous article, we talked about the real role of glasses
, but the role of sunglasses depends on whether the sunglasses are qualified. Only qualified sunglasses can prevent ultraviolet rays, blue light and provide comfortable visual enjoyment. So how to judge sunglasses Is it qualified? 1. Sunglasses that can effectively protect the eyes can block 99% to 100% of UVA and UVB, and filter 75% to 90% of visible light. Therefore, qualified sunglasses must be able to prevent 99% of ultraviolet rays and filter more than 75% of visible light. You can test this by the following methods: stand in front of a mirror and try on it. If you can easily see your eyes in the mirror through the lens, it means that the color of the sunglasses is not dark enough and the visible light is less filtered. Of course, the current There are also many candy-colored sunglasses of this kind. This kind of sunglasses cannot be said to be unqualified, but it is more decorative. YC9720 Women's Sunglasses C01 bright black/grey lens 2, flat sunglasses must ensure that they will not cause distortion or distortion of the vision, otherwise it will cause dizziness and other discomfort when worn. Test method: hold the sunglasses, straighten your arms, observe the right angle or straight line (such as door frame, window) through the lens, move the frame slowly up and down, left and right. If you find distortion, skew, or bend, it means that the lens has an optical defect and is unqualified . 3. The lens color of sunglasses should be uniform. If a certain area suddenly becomes dark, it must be unqualified. Recommended reading: Check whether the sunglasses are qualified or not from two key indicators. In addition, the weight of the sunglasses should be evenly distributed on the nose and ears. We must carefully adjust the curvature of the frame and the position of the nose pad when wearing it to ensure that the frame does not clamp the bridge of the nose or wear The ears and eyelashes should not touch the sunglasses. The above are a few simple ways to judge whether the sunglasses are qualified. If you want to continue to understand, you can pay attention, and more information about glasses is waiting for you! Related reading: Sunglasses selection brand sunglasses
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