1. Beautiful decoration
2. Cover eye defects
3.It can reduce the adjustment burden of the ciliary muscle of the eye under strong light
4. Block harmful light
4. Protect your eyes from damage
5. Wear sunglasses to make your face look thinner. This theory is Olsen sister put forward, her theory is very simple, love beauty, love thin women, always "deliberate" to make themselves look smaller, thinner, the bigger the sunglasses on the bridge of the nose, will make their face look smaller, thereby creating a "thin face" visual effect.