Sunglasses is a way to prevent the sun from strong stimulation of human eye damage to the visual health products, with the improvement of people's material culture, sunglasses can also be as a beauty or reflect the personal style of special jewelry. The cornea and crystals of the human eye are the most susceptible to ultraviolet radiation, and the "cataract" is a closely related eye disease, as the sun rays that reach the Earth's surface contain ultraviolet light. Due to environmental damage to the ozone layer and the increase of people's outdoor activities in summer, the damage of ultraviolet rays to human eyes cannot be neglected.
Wearing sunglasses is a good way to protect your eyeballs from UV damage, but pay special attention to the choice of sunglasses. According to international standards, sunglasses are classified as personal eye protection items, because sunglasses are worn in summer, the main function is to block the glare of the sun. However, the international standards also subdivide the sunglasses into "fashion mirrors" and "general purpose mirrors". The standard of "fashion mirror" quality requirements are relatively low. Because the "fashion mirror" mainly highlights the style, the wearer is focused on the decoration, not the protection function. The standard of "general use mirror" quality requirements are relatively strict, including the UV, as well as the refractive and prism index requirements.
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