Welcome to my store, we have many kinds of price products, we launch new products every day, please follow my store and pay more attention, for more products, Please click on the seller information to enter our store to buy, we hope give you a pleasant shopping experience. Thank you and have a nice day. Sunglasses have many advantages 1. Beautiful decoration 2. Block eye defects 3. Can reduce the adjustment burden of the ciliary muscle of the eyes under strong light 4. Protect your eyes from injury 5. Wearing sunglasses will make your face look thinner. This theory was put forward by Sister Olsen. Her theory is very simple. Women who love beauty and thinness will always make themselves look smaller and thinner. The bigger the sunglasses on the bridge of the nose, It will make your face look smaller, thus creating a skinny face" visual effect. Sunglasses can be generally divided into three categories: sunshade mirrors, light-colored sunglasses and special-purpose sunglasses according to their use. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. Therefore, in outdoor activities, especially in summer, many people use sunshade Mirrors to block sunlight to reduce fatigue or glare from eye adjustment damage caused by the stimulus. Light-colored sunglasses are not as good at blocking sunlight as sunshades, but they are rich in color and suitable for use with all kinds of clothing, and have a strong decorative effect. Light-colored sunglasses are favored by young people because of their rich colors and diverse styles, and fashionable women are even more fond of them. Special-purpose sunglasses have a strong function of blocking sunlight, and are often used in the fields with strong sunlight such as beaches, skiing, mountain climbing, golf, etc., and their anti-ultraviolet performance and other indicators have higher requirements. Different groups of people choose sunglasses according to different preferences and different uses, but the most fundamental thing is to start from the basic principle of ensuring the safety of the wearer and the vision from being damaged. Reducing strong light stimulation, clear vision without deformation, UV protection, color recognition without distortion, and accurate identification of traffic signals should be the basic functions of sunglasses. If the above functions are defective, the effect of sunglasses will be lost at light level, and conscious discomfort such as dizziness and sore eyes will occur in severe cases. . Therefore, the choice of sunglasses can not only focus on style and ignore its inherent quality.