Synoptophore, 1931-1940.

 
Synoptophore, 1931-1940.
4 0 c m
 
29cm
actual image size: 21cm x 32cm

Description

This instrument, with Sharp-Crawford rotary devices, is a modified form of a stereoscope which is used in training the eyes to correct a squint and restore normal binocular vision.

© Science Museum / Science & Society Picture Library

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