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Wright's Night Vision Test
OPTOMETRIC INSTRUMENTS
night vision test
Wright, W.D.
Europe: United Kingdom
c.1940
wood; cardboard
overall: 142 x 203 x 152 mm
2003.202
OPTOMETRIC INSTRUMENTS
night vision test
Wright, W.D.
Europe: United Kingdom
c.1940
wood; cardboard
overall: 142 x 203 x 152 mm
Collapsible photometry test. Black wood. Two hinged upright panels, the smaller enclosing round orange luminous disc, with green fabric padded rest and safety catch. The larger panel supports one from a set of nine square cards, each bearing a Landolt ring of graduated greyness. Also small brown instruction booklet.
2003.202
Ex Keeler Collection