Maddox wing test instrument, c 1920-1937.

Maddox wing test instrument, c 1920-1937.
2 9 c m
40cm
actual image size: 32cm x 21cm

Description

Maddox wing test instrument, made by Weis, London, used to test for imbalances in binocular vision, for example heterophoria; ie the tendency to squint. Full view.

© Science Museum / Science & Society Picture Library

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