A test for colour blindness in which the subject is asked to distinguish numbers or pathways printed in coloured spots on a background of spots of a different colour or colours.
- These tests are sometimes known as the Ishihara test.
- Patients should have baseline visual acuity testing and testing of color discrimination (Ishihara tests).
- Testing of visual acuity and color vision (Ishihara tests) should be performed when EMB is to be used.
Early 20th century: named after Shinobu Ishihara (1879–1963), Japanese ophthalmologist.
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