A pair of Sunglasses Online ultraviolet prevention function, we can't identify with the naked eye, the manufacturer of the product is an express promise consumer choose and buy has the protective function of Polarized Prescription Sunglasses only reference, we can see in some of the product label and Cheap Prescription Glasses positive such as: "100% of ultraviolet prevention", "UV400", "cut off all of the ultraviolet ray", such as "anti ultraviolet" express identity.
Ultraviolet refers to solar rays with a wavelength between 200nm and 380nm, including UVA wavelengths of 315nm to 380nm, UVB wavelengths of 280nm to 315nm, UVC wavelengths of 200nm to 280nm. Among the solar rays that reach the earth's surface (290nm ~ 2000nm), ultraviolet rays account for about 13%, UVA 97%, UVB 3% and UVC close to zero. Ultraviolet damage to the human eye Polarized Glasses is mainly determined by the wavelength of ultraviolet radiation, radiation time and radiation intensity and the strength of the human eye's own defense mechanism, cornea, lens is the most often ultraviolet damage eye tissue, solar keratitis and corneal endothelial injury, solar cataract is the most related eye diseases.
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