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'Photograd' Graduated Photochromic Lenses Demonstration Set
OPHTHALMIC LENSES
photochromic lens
Norville Group
Europe: United Kingdom, England, Gloucestershire, Gloucester
1978
glass; (case) wood; leather; metal; silk
each lens: 55 mm; case: 30 x 234 x 100 mm
2006.371
OPHTHALMIC LENSES
photochromic lens
Norville Group
Europe: United Kingdom, England, Gloucestershire, Gloucester
1978
glass; (case) wood; leather; metal; silk
each lens: 55 mm; case: 30 x 234 x 100 mm
Three sample photochromic lenses: 'Light Single Vision', 'Dark Executive Bifocal', 'Dark Single Vision'. Contained in compartmentalised hinged leather-covered wooden case with yellow metal clasp and cardboard internal rack. White silk lining to case lid.
2006.371
Gift of Norville Optical Group, 2006