Poor quality lenses cause 'sunglass syndrome'

u003cbru003eSunglasses can block ultraviolet rays because a special coating film is added to the lens. The coating film of inferior sunglasses is easy to be damaged. When you see foreign objects, it will deform and twist, so that the eyeball will be sore and swollen. Nausea and appetite will gradually appear. The symptoms of visual fatigue, such as decline, forgetfulness, and insomnia, are collectively referred to as 'sunglasses syndrome'. Now I will introduce how to distinguish the pros and cons of lenses when buying sunglasses. YC9705 Universal Sunglasses C7 White/Colorful Purple 1. Put the sunglasses 40cm-45cm in front of your eyes, and observe the object through the lens. If you find straight line distortion or swing, it means that the lens is deformed and there is a quality problem. It is not suitable to buy; check the lens If there are scratches, impurities, bubbles, streaks, etc., it is not suitable to buy; you can also put the lens up to face the fluorescent lamp and turn it gently. It is not suitable to buy when you feel uncomfortable. Second, observe the color of the lens The color of the lens is very important when choosing sunglasses. Studies have shown that green and gray lenses are better at preventing ultraviolet and infrared radiation. Therefore, gray, green, and good; brown, dark brown, and black followed; blue and purple are poor. The color should not be too light, because it cannot withstand strong light. A good sunglasses should be marked with the words 'uv-400Sunglasses are only suitable for wearing under the scorching sun, not suitable for sunset, cloudy, rainy and indoor. 3. Pay attention to the shape of the lens. The lens should be flat and the transparency should be high. Polarized lenses are required. Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and can be shatter-resistant and abrasion-resistant. If you choose large-lens sunglasses, it is better to be round, which will protect your eyes from radiation damage from the front and side. When you buy sunglasses when the sun is strong, you should look at the surrounding scenery clearly after wearing them, at least you can accurately see the four colors of red, yellow, green and blue. If you have to squint your eyes to see objects clearly, such glasses should not be purchased. The above content is provided, please go to the official website for more information, URL: https://www.yichao.cn/ Related reading: Sunglasses and Sunglasses
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