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Press-On Optics by OSG: 20 Prism Dioptres
OPHTHALMIC LENSES
auxiliary lens; Fresnel lens
Optical Sciences Group, Inc.
North America: USA, California, San Rafael
c.1972
plastic; paper
Lens aperture: 63 mm x 63 mm; inlay card: 73 mm x 73 mm; lens: 73 mm x 73 mm; overall (case): 78 mm x 78 mm
2021.810
OPHTHALMIC LENSES
auxiliary lens; Fresnel lens
Optical Sciences Group, Inc.
North America: USA, California, San Rafael
c.1972
plastic; paper
Lens aperture: 63 mm x 63 mm; inlay card: 73 mm x 73 mm; lens: 73 mm x 73 mm; overall (case): 78 mm x 78 mm
Plastic auxiliary Fresnel lens (straight lines) for press-on adherence to back of spectacles lenses, supplied within a flexible square mount contained in its own plastic jewel case with inlay card dexcribing the daily cleaning procedure. Colour-coded (red) lid to case with supplementary power marked upon it.
2021.810
Gift of Mr Graeme Holland, 2021