u003cbru003eWhen the weather is hot, many fashionable young people like to wear sun
glasses when they go out. It feels cool. But you must be cool. Inferior sun
glasses will not only not protect your eyes but also cause eye diseases! And you must remove the
sunglasses in dark places. So, let me take you to see how to buy
sunglasses scientifically! In addition to being unable to determine whether the lenses can block ultraviolet rays, consumers can check the quality of the lenses visually when buying sunglasses. If you should pay attention to whether the surface of the lens is smooth, free of scratches and bubbles; lay the lens flat and observe whether the lens is warped from the horizontal direction. You can also take the sunglasses 30 cm away from your eyes, and observe the vertical and horizontal lines around you through the glasses, such as window frames or door frames, and intentionally move the glasses up and down. If you find that the observed straight line is distorted or swayed, it means the lens It may be deformed, this kind of sunglasses is not suitable for purchase. Another method is to place the sunglasses in front of your eyes, move the convex side of the lens outwards, and slowly move up and down to observe distant objects from the inside of the lens. If most of the objects are still and there is a wave-like beating locally, it means that the mirror surface is not flat. Lenses that look uneven or have flaws and bubbles on the surface will cause discomfort such as dizziness after wearing them, so they are not suitable for purchase. For sunglasses, pay attention to the surface of the lens to be smooth, free of bubbles, and no wear marks; lay the lens flat, and observe whether the lens is warped or uneven in the horizontal direction. The color selection of the lens should be based on the principle that the color of the surrounding environment is not distorted after wearing it, and the edge of the object is clear. Generally, medium depth is better, such as light gray, light brown, etc., these colors of sunglasses absorb infrared and ultraviolet rays. Great. Related Reading: Sunglasses Polarized Sunglasses Brand
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