Eight Ishihara charts for testing colour blindness, Europe, 1917-1959

Set of 8 Ishihara Charts for testing colour-blindness. Set of 8 Ishihara Charts for testing colour-blindness Set of 8 Ishihara Charts for testing colour-blindness Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Set of 8 Ishihara Charts for testing colour-blindness Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959 Eight Ishihara charts for testing colour blindness, Europe, 1917-1959

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Set of 8 Ishihara Charts for testing colour-blindness.
Science Museum Group
The Board of Trustees of the Science Museum

Set of 8 Ishihara Charts for testing colour-blindness
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Set of 8 Ishihara Charts for testing colour-blindness
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Set of 8 Ishihara Charts for testing colour-blindness
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Set of 8 Ishihara Charts for testing colour-blindness.

Colour blindness is tested using these eight placards. They are known as Ishihara charts. They are named after their inventor, Japanese ophthalmologist Shinobu Ishihara (1897–1963). Each image consists of closely packed coloured dots and a number. The patient must identify the number or image he or she can see. The type of colour blindness a patient has is identified using the range of charts.

There are several types of colour blindness. These range in severity. In dichromatism, there is difficulty seeing one of the three primary colours: red, blue or green. In anomalous trichomatsis, there is reduced sensitivity to certain colours. In the rarer monochromatism, there is no colour vision and the world is seen in white, black and grey shades. Ishihara devised his test in 1917. It is still used.

Details

Category:
Ophthalmology
Object Number:
1959-257
type:
colour blindness test
credit:
Keeler, C.H.