When traveling in summer, we can see that more and more fashionable men and women begin to wear sunglasses. Sunglasses are not only an ornament, but people pay more attention to the protective effect of sunglasses on the eyes. A pair of glasses can not only enhance the appearance but also protect the eyes, which are naturally sought after by more people.So how do you choose the sunglasses you are satisfied with from the dazzling sunglasses market? We have sorted out several common misunderstandings in sunglasses selection to help you choose sunglasses better.
1. Not all sunglasses have 100% UV protection
For sunglasses with UV protection, there are usually the following expressways:
1. Mark "UV400": it means that the isolation wavelength of the lens to ultraviolet rays is 400nm, that is, the maximum spectral transmittance of the lens with a wavelength below 400nm cannot be greater than 2%.
2. Mark "UV" and "UV protection": it means that the blocking wavelength of the lens to ultraviolet light is 380nm.
3. Mark "100% UV absorption": It means that the lens has a 100% absorption function for ultraviolet rays, that is to say, the average transmittance in the ultraviolet range is not more than 0.5%.
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Generally speaking, the sunglasses with the above labels can be regarded as sunglasses with UV protection in the true sense. Those without labels probably just borrowed the name of "sunglasses" and are shoddy.
Second, polarized sunglasses are better than ordinary sunglasses
Sunglass lenses are divided into five types: polarized lenses, anti-reflective coated lenses, colored lenses, colored lenses, and color-changing lenses. These five lenses have different functional effects.
Polarized lenses can block glare and make the field of vision clear and natural, and are generally suitable for outdoor sports such as driving, fishing, going to sea, and skiing.The surface of the anti-reflective coating lens is coated with a thin layer of magnesium fluoride to prevent strong light reflection, suitable for snow or places with strong reflection.Colored lenses are also called tinted lenses. During the lens production process, some chemicals are added to make the lenses show colorful colors. This is the most common type of lens in sunglasses.
Colored lenses have the same effect as colored lenses, but the production method is different. It is to paint the color on the surface of the lens. The familiar gradient-colored lens has the darkest color on the top, and then gradually fades down. Generally, there are sunglasses with degrees. Lenses are mostly treated with paint.The color-changing lens can change the color according to the intensity of the light. The reason is that there is a ski material with silver halide added to the lens so that the original transparent lens will become a colored lens when encountering strong light for protection. This lens is suitable for indoors and outdoors at the same time. in use.
Third, the brand is good
When choosing sunglasses, the most important thing is to choose the right one for you.
4. Sunglasses can be worn as long as they are in summer
Many people think that sunglasses can be worn in summer, but not necessarily in winter. In fact, wearing sunglasses protects the eyes and prevents UV damage. In the cold winter, the atmospheric permeability is strong, and ultraviolet rays are more likely to penetrate the air to reach the surface of the earth. At the same time, when the sun shines on the white snow, there will be strong reflections. This reflection will also cause damage to the eyes. Therefore, in winter Sunglasses are also required to protect the eyes.
5. Sunglasses can be changed all year roundThis concept is seriously wrong. Over time, the lenses of sunglasses will age, making them uncomfortable to wear for a long time. Improper maintenance habits of glasses can also damage sunglasses, such as removing glasses with one hand, improper handling of lenses in contact with water or dirt, exposure to strong light, etc. round sunglasses