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Ishihara test
System: General & Eye–Ear Signs · All general & eye–ear signs
What it is — and how it is elicited
Coloured plates of dots contain numbers or paths visible to people with normal colour vision but not to those with red-green colour deficiency (or vice versa).
What a positive finding suggests
Used to screen for inherited red-green colour vision deficiency.
◈ Behind the name
Shinobu Ishihara (1879–1963), Japanese ophthalmologist.
Related signs — General & Eye–Ear Signs
Browse the I section of the A–Z list or return to the Clinical Signs hub.
Please note: This page is an educational reference about clinical examination signs. A clinical sign supports — and never replaces — a full clinical evaluation, examination and appropriate testing. A sign being present does not by itself prove a diagnosis, and an absent sign does not rule one out. If you have symptoms that worry you, see a health professional.