How much UV protection does sunglasses have?

u003cbru003eIntroduction: Most people still choose sunglasses for aesthetic considerations. They think sunglasses are modern accessories. When buying sunglasses, the appearance of the glasses is the first consideration. Even clothing stores will put them in Lots of sunglasses are available for purchase to match clothing. Although sunglasses have decorative functions, their protective functions are important. In the hot summer, when you go out to play, the sun can hardly open your eyes. In addition to umbrellas and hats for shading, sunglasses are also a good weapon against ultraviolet rays. The dazzling light can penetrate your eyes and cause damage. Sunglasses can reduce the damage to your eyes from strong sunlight. But most people still choose sunglasses for aesthetic considerations. They think that sunglasses are modern accessories. When buying glasses, the appearance of the glasses is the first consideration. Even clothing stores will put a lot of sunglasses. Glasses are available for purchase to match clothing. Although sunglasses have decorative functions, their protective functions are important. The functions of sunglasses as goggles should be: 1, blocking strong light (shading effect) 2, protection function (preventing the eyes from being burned by strong sunlight, and mainly blocking ultraviolet rays) 3, optical correction 4, decorative purposes. If there is no adequate blocking of ultraviolet light, it will cause damage to the eyes in the long run. As an eye protection product, the quality of sunglasses will directly affect the wearer's eye health. According to expert analysis, qualified sunglasses can effectively block ultraviolet rays and protect eye tissue from damage from strong light, while a pair of inferior sunglasses may cause serious damage to the eyes. The lighter ones will make the eyes dry, fatigue, burning and pain. , Tearing, or cause general discomfort such as dizziness, nausea, vomiting, etc. In severe cases, it may cause irreversible permanent damage to the cornea, lens and retina. Ultraviolet rays in sunlight refer to sunlight invisible to human eyes with wavelengths between 200nm and 300nm. According to the wavelength, we divide it into UVA (315~380nm), UVB (280~315), UVC (200~315). The damage of ultraviolet rays to human eyes is mainly determined by the wavelength, radiation time and radiation intensity of ultraviolet rays, and the strength of the human eye's own defense mechanism. The cornea and lens are often damaged parts, which are easy to cause solar keratitis, corneal endothelial damage, and solar cataract. Another characteristic of ultraviolet rays is that the damage to the eyes is cumulative. Experts remind: Qualified sunglasses should effectively block ultraviolet rays. There should be a corresponding mark on the qualified sunglasses lens: For example, UV400 is a lens that blocks ultraviolet rays below 400nm and is completely UV-proof. Consumers should go to a regular hospital optics department or a professional store to buy sunglasses, and they can use a spectrum analyzer to test the UV resistance of the lenses. Conclusion: As an eye protection product, the quality of sunglasses will directly affect the wearer's eye health. According to expert analysis, qualified sunglasses can effectively block ultraviolet rays and protect eye tissue from damage from strong light, while a pair of inferior sunglasses may cause serious damage to the eyes. The lighter ones will make the eyes dry, fatigue, burning and pain. , Tearing, or cause general discomfort such as dizziness, nausea, vomiting, etc. In severe cases, it may cause irreversible permanent damage to the cornea, lens and retina. Article title: How much UV protection does sunglasses have?
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