Anisocoria is a condition characterized by an unequal size of the pupils. (wikipedia)

Various pathophysiological processes can cause anisocoria. However, pupil size depends upon the effects of the autonomic nervous system and the iris muscle.  The parasympathetic system constricts the iris, while sympathetic channels dilate the iris. (emedicine)

Anisocoria is common, although no overall prevalence statistics are available. The incidence and prevalence data for anisocoria depend on the specific pathophysiology. The presence of physiologic anisocoria has been estimated at 20% of the normal population, so some degree of pupil difference may be expected in at least 1 in 5 clinic patients. (emedicine)


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