sunglasses

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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  

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

sunglasses

Eyeglasses that protect the eyes from exposure to visible as well as ultraviolet rays. For optimal eye protection outdoors, wraparound sunglasses or solar shields that block both ultraviolet A and ultraviolet B rays should be worn.

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.
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