How to select sunglasses according to their functions?
1. Sunglasses can be generally divided into sun visors, light sunglasses, and special-purpose sunglasses.
2. The so-called sunglasses, as the name suggests, are used for shading. People usually need to adjust the pupil size to adjust the luminous flux in the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. Therefore, in outdoor places, especially in summer, many people use sunshades to block the sun, so as to reduce the fatigue caused by eye adjustment or the injury caused by strong light stimulation.

3. The blocking effect of light sunglasses on sunlight is not as good as sunshades, but they are rich in color, suitable for matching with all kinds of clothing, and have a strong decorative effect. Because of their rich colors and various styles, light sunglasses are favored by young people, and fashionable women dote on them. Special purpose sunglasses have a strong function of blocking sunlight. They are often used in the field with strong sunlight, such as beach, skiing, mountain climbing, golf, and so on. Their anti UV performance and other indicators have high requirements.
4. Different people choose Sunglasses according to different preferences and uses. But the most fundamental thing is to start from the basic principle of ensuring the safety of the wearer and no damage to their eyesight.
5. The basic functions of sunglasses are to reduce strong light stimulation, keep the visual object clear without deformation, prevent ultraviolet, do not distort color recognition, and accurately identify traffic signals. If the above functions are defective. 
6. It may lose the function of sunglasses, or it may cause conscious maladjustment symptoms such as dizziness and acid swelling of eyes, and sometimes slow response, color discrimination illusion, unequal walking vision, and traffic accidents. Therefore, the choice of sunglasses can not only focus on style but ignore its internal quality.

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