Nine cards for use with a Maddox cheiroscope, 1920-1950.
2 9 c m
40cm
actual image size: 32cm x 21cm

Nine cards for use with a Maddox cheiroscope, 1920-1950.

© Science Museum / Science & Society Picture Library

Description

The Maddox cheiroscope is an instrument used in training the eyes to correct a squint and restore normal binocular vision.
 

Image Ref.

10287597
 

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