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Barrett Sub-Normal Vision Monocular and Testing Set
OPTOMETRIC INSTRUMENTS
sub-normal vision test
London Optical Co; Levers Optical Co Ltd
Europe: United Kingdom
20th c.
metal
1999.160
OPTOMETRIC INSTRUMENTS
sub-normal vision test
London Optical Co; Levers Optical Co Ltd
Europe: United Kingdom
20th c.
metal
Testing set comprising a flanged metal tube with a mounted spherical lens, auxiliary flanged lens, six apertures (three rectangular; three round) in white metal trial lens frames with handles, numbered 1 to 6. Black hinged case with blue silk and velvet lining.
1999.160
College Purchase, 1992