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22mm solid super-centred bifocal lens & envelope
OPHTHALMIC LENSES
lens
Mid 20th c.
glass
overall: 40 x 44 mm; segment: 22 mm
2004.400
OPHTHALMIC LENSES
lens
Mid 20th c.
glass
overall: 40 x 44 mm; segment: 22 mm
Solid super-centred bifocal lens (prism controlled) in plain white lens envelope with handwritten identification. 22mm segment. Ink marking of centre line.
2004.400
Gift of A.S. Whitmore, 2003