dior sunglasses

As the sunlight intensity exceeds the adjustment ability of people’s eyes, eyes will be absolutely hurt. Therefore, people often wear sunglasses to protect their eyes when they are outside, especially in hot summer. In fact, wearing sunglasses also make people look cool. As we all know, sunlight in summer is strong and dazzling so how can a pair of sunglasses prevent it from damaging people’s eyes? Obviously, the special function is closely related with its structure.

Although there are various sunglasses in the market, the structures for most of them are nearly the same. Staining lens is the essential part of sunglasses. The color of sunglasses lenses can decide which colors they could absorb. Grey sunglasses could provide protection against dizzy light. Both amber and brown sunglasses are quite popular and they can absorb UV as well as other lights of high-frequency colors. Green lens could filter some blue and reduce dizzy light. Yellow or golden sunglasses also can reduce blue which often causes dizzy light effect and allows other colors to pass through lenses. Polarization filter of sunglasses also reduces dizzy light. Sunlight and other lights from artificial light source usually vibrates and disseminates in all directions. In such case, light is considered as polarization and dizzy light occurs. But polarization filter of sunglasses can solve the problem. Half-silvered surface of sunglasses is a kind of thin reflective coating which can flash back half of lights reaching glasses and let the other half pass. The surface helps people see clearly. However, the thin reflective coating is easily scratched. Sunglass is made of glass which is fragile. Therefore, the coating against scratching is put onto the sunglasses to protect lenses. Back dizzy light is the common problem for various sunglasses and anti-reflective coating is indeed necessary. UV could cause various diseases to people’s eyes so anti-UV coating is also put onto sunglasses.