The sun glasses how much uv protection function

Guide language: the majority of people to choose the sun glasses still stay in beautiful consideration, think that the sun glasses is fashionable accessories, in the shapes of glasses as the first consideration when buying requirements, even boutiques will put a lot of sunglasses for people to choose and buy to tie-in dress. The sun glasses have the function of decoration, but its protective function that is important.
sorching summer, go out, eyes are hard to open to the sun people, in addition to the umbrella, hat can shade, sun glasses is against ultraviolet light weapons. Dazzling light will pass through your eyes, the sun glasses can reduce sun damage to the eyes.
but most people the choice of sunglasses for still stay in beautiful consideration, think that the sun glasses is fashionable accessories, in the shapes of glasses as the first consideration when buying requirements, even boutiques will put a lot of sunglasses for people to choose and buy to tie-in dress. The sun glasses have the function of decoration, but its protective function that is important. Sunglasses as goggles its function should be: 1, block light, Shading effect) 2, protection function, Prevent sun burned eye, more mainly block uv) 3, optical correction 4, decoration purposes. If there is no moderate blocking ultraviolet ray, come down for a long time will cause harm to the eyes.
as a kind of eye protection products, the quality of the sunglasses fit and unfit quality will directly affect the wearer's eye health. According to expert analysis, the qualified sunglasses can effectively block the ultraviolet ray, protect eyes tissues from light damage, and a pair of inferior sunglasses may bring serious damage to eyes, light person can make hot and dry eyes, fatigue, pain, tears, or cause the whole body discomfort such as dizziness, nausea, vomiting, may be on the cornea, the person that weigh crystals and irreversible permanent damage the retina.
the ultraviolet ray in sunshine refers to between 200 nm to 300 nm wavelength by the human eye can't see the sun's rays. According to the wavelength, we divided it into UVA ( 315 ~ 380海里) ,UVB( 280 ~ 315) ,UVC( 200 ~ 315) 。
ultraviolet radiation to the human eye damage mainly depends on the wavelength of ultraviolet radiation, radiation time and strength, the strength of the defense mechanism and human itself. Cornea, crystal is often damaged parts, easy cause sunlight keratitis and corneal endothelial injury, daylight cataract. Ultraviolet (uv) light has a characteristic, that is, to eye damage is cumulative.
the expert reminds: qualified sunglasses should effectively prevent ultraviolet ray. Qualified sunglasses lenses should have corresponding identification: such as UV400 for block below the wavelength of 400 nm uv, is completely uv lens. Consumers' good to normal hospital department or speciality store to buy sunglasses, when buying by spectrum analyzer and to test the lens of uv resistance.
conclusion: as a kind of eye protection products, the quality of the sunglasses fit and unfit quality will directly affect the wearer's eye health. According to expert analysis, the qualified sunglasses can effectively block the ultraviolet ray, protect eyes tissues from light damage, and a pair of inferior sunglasses may bring serious damage to eyes, light person can make hot and dry eyes, fatigue, pain, tears, or cause the whole body discomfort such as dizziness, nausea, vomiting, may be on the cornea, the person that weigh crystals and irreversible permanent damage the retina.
the article title: sunglasses uv protection function of how much

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