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impact-resistant lenses that protect the eyes from blows or other kinds of injury. Such lenses are usually made by tempering the glass, substituting plastic for glass, or laminating. Also called polycarbonate glasses, safety lenses.
Glasses using heat-treated glass or impact-resistant plastic lenses. Their use serves to protect the eyes from dangerous slivers of glass that are produced when ordinary lenses are broken in an accident. Use of safety glass in manufacturing eyeglass lenses is mandatory in the U.S.
See also: glasses