The Argyll Robertson pupil can be found with either general paresis or tabes dorsalis in late neurosyphilis.
Features of the Argyll Robertson pupil:
(1) The patient has vision in the eyes (not blind).
(2) The pupils are small and fixed.
(3) The pupils do not react to strong light.
(4) The pupils do not dilate with strong pain.
(5) The pupils constrict with convergence and accomodation.
(6) Atropine and other mydriatics only partially dilate the pupils.
(7) Physostigmine constricts the pupils.
