In the previous article, we discussed “Best Food For Eyesight Improvement”. In this article, let’s talk about “How To Pick The Right Sunglasses”.
A good pair of sunglasses can instantly enhance your image, even if you only wear jeans and a T-shirt. Of course, the trick is to know what sunglasses are right for you. We not only hope you can choose a pair of sunglasses that make you look good, but we also hope to help you choose sunglasses with good protection.
Why do you need sunglasses?
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.(https://www.koalaeye.com/collections/polarized-sunglasses)
Filter blue light. Long-term exposure to ultraviolet light and short-wavelength blue light is a risk factor for age-related macular degeneration (AMD).
Comfortable vision. Bright and dazzling sunlight will make the eyes uncomfortable, affect the clarity of vision, and people will squint and cry.
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
Blocking 99-100% UVA and UVB and filtering 75-90% visible light are the basic requirements of a good pair of sunglasses. It not only absorbs ultraviolet rays, but also does not cause distortion of vision.
Don't be misled by the 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 professional optical store.
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.
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.
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. But this method does not apply to color-changing lenses.
The weight of the sunglasses is evenly distributed on the nose and ears. Carefully adjust the curvature of the frame and the position of the nose pads. The frame does not clamp the bridge of the nose or grind the ears. When wearing, the eyelashes cannot touch the frame.
Different types of sunglasses
1. Polarized sunglasses
Polarized sunglasses can reduce glare and is used on roads, water, ice surface and snowfield. They are 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. However, if you wear polarized glasses during driving, you will not be able to see the LED display in the car, GPS and mobile phone screens, and other digital display. It is recommended to choose yellow, brown, and blue for lens color, 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
Myopic 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 more slowly. Sometimes the indoor light is too strong and the color of the lens becomes darker. The discolored lenses are not dark enough, especially in environments where the sun's reflection is strong, such as beaches, snow, water sports, etc., to replace sunglasses because color-changing sunglasses cannot bring sufficient visual comfort.
3. Mirrored sunglasses
The American police likes this style of mirrored sunglasses very much! In 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. Alos, they are very popular in extreme sports.
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