Use Classification Of Sunglasses
High quality sunglasses, also known as sunshade mirrors, are used to shade from the sun. People in the sun usually need to adjust the size of the pupil to adjust the light flux, when the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye.
Therefore, in outdoor activity places, especially in summer, it is necessary to use a good sunshade mirror to block the sun, in order to reduce the fatigue caused by eye regulation or the damage caused by strong light stimulation. Sunglasses can be divided into sunshade glasses, light sunglasses and special purpose sunglasses. 
The so-called sunshade mirror, as the name suggests, is used for sunshade. People usually need to adjust the pupil size to adjust the light flux in the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. So in outdoor places, especially in summer, many people use sunshade mirrors to block the sun, in order to reduce the fatigue caused by eye regulation or the damage caused by strong light stimulation. Light colored sunglasses do not block the sunlight as well as high-quality sunshade glasses, but their rich colors are suitable for all kinds of clothing collocation, have a strong decorative role. Light colored sunglasses are favored by young people and fashionable women because of their rich colors and diverse styles. Special purpose sunglasses have a strong function of shading the sun. They are often used in the field where the sun is strong, such as beach, skiing, mountain climbing, golf, etc., and their ultraviolet resistance performance and other indicators have high requirements. 
Different people, according to different preferences and different uses to choose sunglasses, but the most fundamental is to ensure the safety of the wearer and eyesight is not damaged from the basic principle. The basic functions of good sunglasses are to reduce glare stimulation, to see things clearly without distortion, to prevent UV, to recognize colors without distortion, and to identify traffic signals accurately. If the above functions are defective, they can lose the function of sunglasses, and even cause symptoms such as dizziness and sore eyes. Sometimes, they can suffer from slow reactions, color discrimination, uneven vision when walking, and traffic accidents. Therefore, choosing high-quality sunglasses should not only focus on the style and ignore the intrinsic quality.
