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sunglassesA 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
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
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.