Left Adie tonic pupil. A, The left pupil reacts poorly to a direct light stimulus, whereas the right pupil demonstrates a strong consensual response. B, Both pupils constrict as the patient fixates on a near target. The response of the left pupil to near effort is better than its response to light (light–near dissociation). C, After the patient refixates on a distant target, the right pupil quickly redilates. The left pupil is slow to redilate (it is smaller than the right pupil), a sign of tonicity.