Knowledge

Anti-ultraviolet, infrared, anti-glare, anti-wind and sand. A flat film with anti-radiation effect appears. Various chemical ingredients are added to make the color different and h

It can be distinguished with the help of a black background under a 60-watt incandescent lamp. High-quality products should not have obvious scratches, pitting, chipping, sand hole

​In the box method, it is the difference between the horizontal size of the circumscribed rectangle. Therefore, LSWF should indicate whether it is the box method.

​Sunglasses can generally be divided into three categories: sun-shading mirrors, light-colored sunglasses and special-purpose sunglasses.

When the eye receives too much light, it will naturally shrink the iris. Once the iris shrinks to its limit, people then need to squint. If there is still too much light, such as s

The human body has an instinctive response to self-protection. When the eyes encounter strong light, the pupils will naturally become smaller, which reduces the ultraviolet energy

Fold. In the design of the mirror frame, usually the left temple is folded first and then the right. Pick and wear. During operation, use both hands to operate, hold the temples an