Advantage

1. Beautiful decoration

2. Blocking eye defects

3. Can reduce the adjustment burden of the eye's ciliary muscle under strong light

4. Block harmful light

5. Protect eyes from harm

6. Wearing sunglasses, your face will look thin. This theory was put forward by Sister Olsen. Her theory is very simple. A woman who loves beauty and skinny will always “considerate” to make her look smaller and thinner. Make your face look smaller, creating a "thin face" visual effect.

Disadvantage

1. Poor quality lenses are likely to cause damage to the eyes. They cannot resist radiation, UV, and polarized light.

2. long time wear will leave scars under the bridge of the nose. 3. Add weight to the ear.