Guidelines for special eyewear

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      <subfield code="a">Technological advances have resulted in sophisticated photochromic sunglasses, laser protection lenses, and several types of contact lenses. All require special attention. The safety professional should be familiar with three special types of eyeglass lenses that industrial employees may wear today, in adittion to their regularly prescribed types, such as single focal, bi-focal, and tri-focal lenses. The special types of lenses include photochromic, laser protection, and contacts</subfield>
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      <subfield code="g">Vol. 117, nº 1, January 1978 ; p. 43-48</subfield>
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