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Cone (Prism) Test Lens
TRIAL CASES, FRAMES AND REFRACTOR HEADS
diagnostic trial lens
Europe: United Kingdom
Mid 20th c.
metal; glass
aperture: 16 mm; overall: 51 mm x 38 mm
2009.198
TRIAL CASES, FRAMES AND REFRACTOR HEADS
diagnostic trial lens
Europe: United Kingdom
Mid 20th c.
metal; glass
aperture: 16 mm; overall: 51 mm x 38 mm
Diagnostic trial lens with cone-shaped glass prism centre set within black inner mount and white metal outer trial lens rim with handle.
2009.198
College Purchase, 2009