UV (Ultraviolet Radiation) consists of the short, invisible rays from the sun that reach the earth's surface. These rays contain three separate bands: UVA (315-380 nm), UVB (290-315 nm) and UVC (100-290 nm). UVC rays are absorbed...
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UV (Ultraviolet Radiation) consists of the short, invisible rays from the sun that reach the earth's surface. These rays contain three separate bands: UVA (315-380 nm), UVB (290-315 nm) and UVC (100-290 nm). UVC rays are absorbed by the earth's atmosphere and do not reach the earth's surface and therefore do not relate to sunglass performance. UVB rays are the " sunburn " rays. Exposure to UVB rays can potentially produce harmful effects to your eyes and may be associated with cataracts and retinal damage. UVA rays are mostly absorbed within the lens of the human eye, debate over the potential effects of UVA exposure continues within the industry. Sunglass standards place limits on UVA and UVB exposure . UV radiation is strongest at high altitudes, low latitudes and in open or reflective environments (sand, snow or water
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From the list : Things I Can't Live Without by markcijo
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