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Argyll Robertson pupil
System: Neurological Signs · All neurological signs
What it is — and how it is elicited
A small pupil that constricts when focusing on a near object but does not react to light — light–near dissociation.
What a positive finding suggests
Classically associated with neurosyphilis, although other midbrain lesions can produce it.
◈ Behind the name
Douglas Argyll Robertson (1837–1909), Scottish ophthalmologist.
Related signs — Neurological Signs
Browse the A 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.