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OSG Fresnel lens
OPHTHALMIC LENSES
lens
North America: USA
Mid-late 20th c.
plastic; vinyl
overall (lens in square mount): 74 mm x 73 mm; overall (outer case): 76.5 mm x 79 mm x 13 mm; overall (round lens): 74 mm

Low vision Fresnel lens comprising a semi-flexible plastic square with rounded aperture and concentric rings, stuck to a black vinyl supporting mount. Supplied in a square shaped transparent plastic case, together with one other round concentric ring Fresnel lens in rigid plastic.


2013.687

The Norman Bier Collection, transfer from City University, 2013



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