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Sunglasses |
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Sunglasses Tinted protective eyewear used to decrease the eye’s exposure to potentially harmful sunlight. Sunglasses are rated according to the amount of UV light they block.
sunglasses Spectacles that have tinted lenses. They are used to protect the eyes from bright sunlight, for special cases (e.g. fear of light) or for cosmetic reasons. See cataract; tinted lens; photophobia; pterygium; ultraviolet.
sunglasses A tinted pair of glasses used to ↓ light arriving at the eye, which are labeled according to the amount of UV light blocked; nonprescription glasses are classified according to use and amount of UV radiation blocked
Sunglasses
Cosmetic sunglasses Block 70% of UVB, 20% of UVA; designed for 'around town' use, 'looking cool'
General purpose sunglasses block 95% of UVB, 60% of UVA; designed for most outdoor activities
Special purpose sunglasses block 99% of UVB, 60% of UVA; designed for very bright environments–eg, snow, open boat yachting, laser work; prescription sunglasses are constructed of plastic or glass–eg, CR-39, polycarbonate,
polychromic glass; the solar radiation-protecting chemical is allyl diglycol carbonate NY Times 16/11/93; C5
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