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An Ishihara Chart for testing colour-blindness, c 1959.

UNITED KINGDOM - DECEMBER 21: Most colour blindness is inherited, and affects more men than women. Colour blindness usually involves confusion between red, green and yellow. Dr Shinobu Ishihara, Professor Emeritus of the University of Tokyo, Japan, designed this series of plates as a test for colour blindness. The test involves the patient being able to distinguish a number within the coloured field at the centre of each chart. (Photo by SSPL/Getty Images)
UNITED KINGDOM - DECEMBER 21: Most colour blindness is inherited, and affects more men than women. Colour blindness usually involves confusion between red, green and yellow. Dr Shinobu Ishihara, Professor Emeritus of the University of Tokyo, Japan, designed this series of plates as a test for colour blindness. The test involves the patient being able to distinguish a number within the coloured field at the centre of each chart. (Photo by SSPL/Getty Images)
An Ishihara Chart for testing colour-blindness, c 1959.
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Credit:
Science & Society Picture Library / Contributor
Editorial #:
90757279
Collection:
SSPL
Date created:
December 21, 2005
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License type:
Rights-managed
Release info:
Not released.ÌýMore information
Source:
SSPL
Object name:
10459514
Max file size:
3504 x 3500 px (11.68 x 11.67 in) - 300 dpi - 4 MB