Sunglasses buying skills

u003cbru003eThe purchase of sunglasses is very knowledgeable. Improper selection can easily cause damage to the eyes, so pay special attention when choosing sunglasses.　　 You should go to a regular glasses shop and choose sunglasses with anti-ultraviolet function produced by regular manufacturers. The glasses sold by street stalls and hawkers often fail to meet the UV protection standards, so don't buy them.　　 When choosing, pay attention to the surface of the lens to be smooth, without ripples, blemishes, bubbles, and wear marks. Lay the lens flat and observe whether the lens is warped from the horizontal direction. Lenses with unevenness, marks or bubbles are not suitable for purchase.　　 The color selection of the lens should be based on the principle that the color of the surrounding environment after wearing it is not distorted, the edge of the object is clear, and the signal lights of different colors can be effectively identified. The choice of the shade of the lens color should be determined by the venue, generally a medium depth is better, such as light gray, light brown, light green, etc. These colors of sunglasses absorb infrared and ultraviolet rays better. Of course, if a strong shading effect is required, darker lenses should be selected. However, cyclists or motorists should not choose too dark lenses, otherwise they cannot effectively identify traffic lights of different colors.　　 In addition, when buying sunglasses, you have to consider the matching relationship with eye size, face shape, eyebrows, and nose. Generally, people with big eyes should choose sunglasses with large frames, and those with smaller eyes should choose sunglasses with smaller frames; people with a fat and round face are suitable for sunglasses with a thick frame, and people with a thin face are suitable for sunglasses with a round frame, flat round People with a face should choose sunglasses with a slightly narrower square frame. Of course, if you face the computer every day, you can also choose sunglasses with anti-radiation glasses!

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