Know who is the woman wearing sunglasses with leaves in front.

Usually it is colorless and transparent indoors, but it will soon turn gray or other colors when exposed to the sun. The color of these glasses can automatically darken or brighten with the intensity of sunlight. This is because a small amount of silver halide is added to the dichroic mirror as a sensitizer.

Trace copper is used as sensitizer. This kind of lens that can automatically adjust the light and shade can be ground into a lens with a degree of vision correction, which is suitable for myopia and hyperopia patients. Unfortunately, its degree cannot exceed 3 diopters (commonly known as 300 degrees), because no matter how big the degree is, the thickness of the center and the edge is very different, and the color depth of the glasses is also very different.

Crystal lens:

Can't block infrared and ultraviolet rays. The performance of colored crystal lenses is not as good as that of glass lenses. Some people say that crystal lenses don't hurt the eyes, but they are cool and eye-catching, which is unfounded.

Living in the sun for a long time, people's eyes have adapted to the surrounding environment and do not need protection in daily life. It is beneficial to wear a pair of sunglasses when working outdoors, but it should be chosen according to the nature and environment of the work.

Wearing sunglasses as an ornament, regardless of the occasion or place, such as evening or even evening, is not only impolite, but also increases the burden on the eyes, which is not conducive to eye health care.