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Barrett Sub-Normal Vision Monocular and Testing Set
OPTOMETRIC INSTRUMENTS
sub-normal vision test
London Optical Company
Europe: United Kingdom
20th c.
metal
overall: 50 x 127 x 80 mm

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 white metal clasp and blue silk and velvet lining. Yellow single-sheet, printed instruction leaflet.


2000.10

Gift of David G. Williamson, 2000



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