outdoors is also a kind of eye protection. But many people don't understand that it is necessary to wear qualified sunglasses. A pair of qualified sunglasses must be able to block the passage of ultraviolet rays and have good resolution for traffic signals of different colors. Moreover, the regular sunglasses belong to the flat lens series, and the diopter is strictly controlled below 0.008 degrees. Recommended reading: pay attention! These people are not suitable for wearing sunglasses. An expert in ophthalmology said that in the outpatient clinic, she often met some patients who shed tears and are afraid of light when they wear sunglasses. Most of the sunglasses they choose are red, green and green sunglasses, which are contrary to the light colors advocated in medicine. In fact, brown, light green, etc. are good colors for the eyes. Wearing dark-colored glasses will make the eyes in a darkroom environment. The pupils of human eyes will automatically dilate in a dark environment. Long-term pupil dilation can easily cause glaucoma and other diseases; inferior sunglasses can also cause more ultraviolet rays to penetrate the eyes, which can easily cause sunlight Diseases such as keratitis, corneal endothelial damage, and macular discoloration of the eyeball; darker-colored glasses reduce the eye's ability to distinguish colors, which may cause color confusion and cause traffic accidents. How to choose sunglasses When buying sunglasses, you must pay attention to the lens, tag, color and UV index of the product. Every formal qualified product has a certificate of quality inspection, and the merchant should show the relevant certificate when purchasing. The tag on the sunglasses is regarded as the 'ID card' of the product, which indicates the origin of the glasses, and also hides a lot of useful information, such as whether the glasses you are buying are sunglasses or light-colored lenses, resin lenses or other materials... This should not be ignored. In order to prevent ultraviolet rays, it is better to buy light gray, light green, blue gray sunglasses with real sun-shading lenses, because these relatively soft colors will not change color when you look at nature. For sunglasses, the UV index is an important criterion for filtering out ultraviolet rays. At present, the UV index of most sunglasses is between 96-98%, and dark lenses are better than light lenses. How to wear sunglasses 1. If ordinary people are not like mountaineers or people with special needs, it is best not to wear sunglasses for a long time. 2. Most people now wear sunglasses, in addition to the protective function, they will also consider the role of decoration, but everyone should not forget their health for the sake of temporary beauty. 3. Many people do not take off their sunglasses when entering from the outdoors. This is a bad habit. The intensity of indoor light makes it unnecessary to wear sunglasses. 4. Sunglasses should not be worn for a long time. If you feel tired of your eyes, or after 30 minutes of continuous wearing, it is best to take them off and change your environment. 5. People over the age of 40 and people with glaucoma are not suitable for wearing sunglasses. Related reading: high-end sunglasses polarized sunglasses
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