outdoors in summer is also a kind of eye protection. However, experts in ophthalmology emphasize 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: Tips for buying sunglasses. An expert from Ophthalmology Department said that in the outpatient clinic, she often met some patients who wore sunglasses and were afraid of light. 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; poor-quality sunglasses can also cause more ultraviolet rays to penetrate the eyes and easily cause sunlight Diseases such as keratitis, corneal endothelial injury, 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. You should try to wear sunglasses when you are outdoors in summer, but not all situations are suitable. In the shade without sunlight, you can take off your sunglasses and let your eyes rest in natural light for a while. 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. For UV protection, it is best to buy sunglasses with light gray, light green, and blue gray that have real sun-shading lenses, because these relatively soft colors will not change color when looking 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. Ordinary people, if they are not climbers 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 also consider the role of decoration, but everyone can not forget their own health for the sake of temporary beauty. 3. Many people do not take off their sunglasses when they enter the room from the outdoors. This is a bad habit. The intensity of indoor light makes it unnecessary to wear sunglasses. 4. Sunglasses cannot be worn for a long time. If you feel a little 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 40 years old and people with glaucoma are not suitable for wearing sunglasses. ??
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