How to buy sunglasses in summer

u003cbru003eFirst of all, the primary purpose of our purchase of sunglasses is to minimize the damage of ultraviolet rays to the eyes, and secondly, to dress up. Then we must pay attention to the UV index of sunglasses, that is, the effect of filtering ultraviolet rays. Ray-Ban RB4221-F Men’s sunglasses 6170/55 Blue Human eyes perceive light in the range of visible light with a wavelength of 380-780nm. Ultraviolet rays refer to light with a wavelength below 380nm, which is invisible light. For example: The meaning of UV380 is to effectively block light with a wavelength below 380nm. A pair of qualified sunglasses can not only protect the eyes and the delicate skin around the eyes, but also have a certain preventive effect on sunburn. Because our eyeballs have an instinctive response to self-protection, the pupils in the eyeballs will actively adjust the size according to the intensity of light. When the eyes are stimulated by strong light, the pupils will naturally decrease, reducing the amount of ultraviolet rays entering the eyes; When the light contrast is dark, the pupils will naturally expand, which increases the amount of light entering the eyeball, and then has a better visual quality. Ray-Ban RB3449 Men's Sunglasses Silver/Lens Colorful Blue 004/55 If we are eager for cheap or beautiful, choose inferior sunglasses, because inferior sunglasses not only can not block ultraviolet rays, but also severely reduce the transmittance of the lens. When the light passing through the lens becomes darker, the pupil of the eyeball is enlarged, and ultraviolet rays will be injected a lot. After a long time, it may cause lens opacity, retinal damage, cataracts, macular degeneration and other eye diseases. Such sunglasses not only cannot help, but also cause eye damage. Therefore, we believe that if you want to purchase excellent sunglasses, you should go to a regular optical shop to choose sunglasses with anti-ultraviolet function produced by a regular manufacturer. Choose the color of sunglasses, pay attention to Ray-Ban RB3532 Men's Sunglasses 001/68 gold, and then choose the color of sunglasses. Commonly, the colors of the lenses are red, gray, green, blue and other colors. We think that the color of the lens is better than gray and green, because the lens of these colors absorbs infrared and ultraviolet better, and can improve the visual contrast and clarity. In addition, it is not that the darker the color of the glasses, the better the effect of blocking ultraviolet rays. Even if the color of the lenses is darker, they may not be able to effectively prevent ultraviolet rays. Therefore, you must choose lenses that are marked with UV protection. Generally speaking, the most suitable color shade is. After wearing glasses, others can only see your eyes vaguely. If you put on sunglasses, others can see your eyes very clearly, then your lens The color is too light. Of course, when we buy sunglasses, we should also pay attention to whether the lens is smooth, flat, and whether there are scratches on the lens surface. In the end, I hope that we can all buy a pair of sunglasses that are good for the health of our eyes and suitable for ourselves. Related reading: Sunglasses Brand Sunglasses

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