Know the precautions for buying sunglasses this summer

Summer is coming soon. In the summer, the phenomenon of driving with sunglasses has increased. How to choose sunglasses accurately has become a problem. When car owners choose sunglasses, brown and gray polarized lenses are better. Choose, it can effectively block the ultraviolet rays, but also filter the reflected light. So what are the issues to pay attention to when buying sunglasses? Tawny and gray have good sun-shading effect. 'For the sunglasses worn when driving in summer, it is not advisable to choose sunglasses with obvious decoration effects such as pink, purple, light blue, etc. These colored glasses basically cannot protect the eyes. In addition, they may be changed. Chromatic aberration occurs due to color.” You should wear brown and gray glasses when driving. Brown lenses can filter out a lot of blue light, which can effectively improve visual contrast and clarity; while gray lenses can evenly absorb arbitrary color spectrum, and there will be no obvious chromatic aberration after wearing. Some consumers will purchase very dark sunglasses, which is not a wise move. 'If the color is too dark, the human vision will be relatively dark, the pupils of the eyes will be enlarged, and the ultraviolet rays penetrating into the eyes will be absorbed more, which will cause more damage to the eyes. If this is the case for a long time , It is likely to cause diseases such as light cataracts and macular degeneration.” It is understood that there are three types of sunglasses, including color-changing lenses, dyeing lenses, and polarizing lenses. Sunglasses suitable for car owners are polarized lenses. The polarizer has polarizing properties. It can not only effectively block a lot of ultraviolet rays, but also filter out excess reflected light. Sunglasses on the market should have no power, but some poor quality glasses will have astigmatism, low power, prisms and so on. If you want to distinguish whether it has a degree, you can align the lens pair with a vertical and horizontal part, such as a door frame, a window frame, etc., shaking up and down, and the object is distorted, you can judge the quality of the pair of glasses. The UV coefficient UV400 only meets the specification. 'Good quality sunglasses can block ultraviolet rays, but also block strong and reflected light, and have a protective effect on the eyes. Inferior lenses have poor transparency and cannot effectively block ultraviolet rays. It will also be extremely difficult to see. It damages the lens and induces other eye diseases.” The sunglasses on the informal street stalls and street stalls do not have quality assurance. It is better to buy sunglasses at a regular optical shop. It is understood that the quality of sunglasses has a great impact on the imaging effect. Unclear and unreal imaging may cause traffic accidents. The UV-resistant coefficient of the general qualified sunglasses is UV400. There are many poor quality glasses on the market. The light transmittance and shading effect of these glasses are far from the norm, and the UV protection coefficient is basically 340-350. Or even lower. Many car owners like to put the sunglasses behind the windshield. After the sunglasses are exposed to high temperature, the frame of the glasses will be severely deformed and distorted. Some of the poor quality lenses will be damaged after high temperature, and the sun will be directly lost. Features. It is better to wrap it up and place it in a dark and dark place. At present, many car owners with myopia will buy sunglasses. In addition to the selection and processing of customized sunglasses, the selection of color changing lenses is one of the new ways in recent years. The color-changing lens is ordinary optical glasses when it is indoors, but when it goes outdoors, it can become a colored lens that can filter ultraviolet rays and be used as sunglasses. Related reading: Sunglasses and sunglasses
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