Sunglasses purchase guide (1)

u003cbru003eAccording to the popular science on the website of the American Optometric Association, the editor translated and summarized this sunglasses shopping guide. There is a lot of information, and everyone takes what they need. Recommended reading: Sunglasses happened after 50 hours of exposure. First of all, people should wear sunglasses when they are outdoors, whether they are working, driving, or exercising, walking, or running. Why do you need sunglasses? 1. Filter ultraviolet rays. The sun's ultraviolet (UV) radiation can cause human cataracts, pterygium, eyelid skin cancer and electro-optical ophthalmia (also called snow blindness, which is corneal damage). A hat with a wide brim can only block 50% of the ultraviolet rays reaching the eyes, so you also need to wear sunglasses. 2. Filter blue light: Long-term exposure to ultraviolet light and short-wavelength blue light is a risk factor for age-related age-related macular degeneration (AMD). (Editor's supplement: Age-related macular degeneration, the prevalence rate in Europeans is 12.3%, and the prevalence rate in Asians is 7.4%, Wan Ling Wong, Lancet Global Health, 2014) 3. Comfortable vision: bright and dazzling sunlight will make the eyes uncomfortable, affect the clarity of vision, and people will squint and cry. 4. Enhanced dark adaptation: After 2-3 hours in bright sunlight, people's adaptability to indoor lighting and nighttime will be reduced, making night driving more dangerous. How to buy quality-guaranteed sunglasses: 1. The basic requirements of sunglasses: block 99-100% of UVA and UVB; filter 75-90% of visible light; absorb ultraviolet rays without causing distortion and distortion of vision; 2. Don't be misled by fake UV filter logo (100% UV absorption or UV400 label on the lens). In order to ensure that these labels are true, it is best to buy sunglasses in a store that can test the UV filter performance of the lens, or buy from a regular channel. Editor's comment: When I was in Beijing, a nurse in Corey bought fake Du0026G sunglasses and was dizzy and nauseous while walking. This shows that the refractive power of the counterfeit lens is not 0. 3. The color of the lens is uniform, and a certain area will not darken. If it is a gradient lens, the lens color should gradually become lighter from top to bottom. The sunglasses worn when driving should be gray (gray, smoky gray, gray-green), so that it does not affect the color of the traffic light. 4. Make sure that the lens does not produce distortion of vision. Hold the sunglasses, straighten your arms, and look through the lenses at a right angle or straight line (such as door frames, windows). Slowly move the frame, up and down, left and right. If there is distortion, skewing, or bending, it means that the vision is distorted, and the lens has optical defects and is unqualified. 5. Make sure the lens can block enough visible light and try it on in front of the mirror. If you can easily see your eyes through the lens, it means that the color of the sunglasses is not dark enough. Note: This method does not apply to color-changing lenses. 6. The weight of the sunglasses is evenly distributed on the nose and ears. Adjust the curvature of the frame and the position of the nose pad carefully. When wearing, the eyelashes cannot touch the frame. Types of sunglasses 1. Polarized sunglasses can reduce glare and are used on horizontal roads and water, ice, and snow. It is worn when driving, skiing, water skiing, golfing, or cycling. For elderly people who are sensitive to light after cataract surgery, choose polarized sunglasses to improve visual comfort. Please pay attention to driving, wearing polarized glasses, you will not be able to see the LED display in the car, GPS and mobile phone screens, ATM and fuel pump digital display, etc. Recommended colors: yellow, brown, and blue, which can filter blue light. Polarized sunglasses cannot be used for flying. For certain sports, such as golfing, wearing polarized sunglasses may cause some visual information to be lost and affect expressiveness. 2. Color-changing sunglasses Myopia people like the convenience of color-changing sunglasses. The color of the lens becomes darker or lighter with the intensity of the light. However, when entering an indoor or outdoor environment, the lens cannot change color immediately. The car windshield interferes with the discoloration of the lens, so it is not as effective when driving. In a cold environment, the lens discolors slowly. Sometimes the indoor light is too strong and the color of the lens becomes darker, which looks strange. The discolored lenses are not dark enough, especially in environments where the sun's reflection is strong, such as beaches, snow, water sports, etc., cannot replace sunglasses, and cannot bring sufficient visual comfort. 3. Reflective mirror sunglasses have a one-way mirror surface. The American police uncle likes this very much! This way the other party cannot see the police's eyes and expressions, which is conducive to self-protection. The color of the mirror reflective coating is varied, which is determined by the thickness and structure of the coating, and the wearer's visual experience is not colorful, generally brown or gray. The reflective coating will reduce the light passing through the lens by 10-60%, so it is very suitable for deserts, sea lakes, snowy mountains and high altitude areas. Very popular in extreme sports. ??
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