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Landolt's Ophthalmo-Dynamometer with Thread Optometer
ORTHOPTIC INSTRUMENTS
ophthalmo-dynamometer; optometer
Europe: France
c.1900
metal; brass; ivory
1999.3851
ORTHOPTIC INSTRUMENTS
ophthalmo-dynamometer; optometer
Europe: France
c.1900
metal; brass; ivory
Instrument for measuring positive convergence comprising a hollow black cylinder with white-painted interior and brass base. Cylinder wall features narrow vertical slit and vertical row of pinholes opposite. Three small hooks suspended from cylinder. Supplied together with a Von-Graefe Thread Optometer (Landolt's modification) with a black metal head incorporating a vertical line of target holes on a sliding plate and an ivory handle with brass stem.
1999.3851
BOA Purchase, 1938