Stilling test

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A test for colour-blindness and colour deficiency in the form of a pseudo-isochromatic chart composed of dots of equal brightness but different hues arranged to form large numerals visible to viewers with normal vision. This test, the first to use a pseudo-isochromatic chart, was modified and adapted by the Japanese ophthalmologist Shinobu Ishihara (1897–1963) to form his famous Ishihara test. Also called the Stilling Colour Chart or Stilling's Colour Table. Compare Holmgren test. [Named after the German ophthalmologist Jacob Stilling (1842–1915) who developed it]

Subjects: Psychology.

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