Anisocoria is a condition in which the pupil of one eye differs in size from the pupil of the other eye. Yourpupils are the black circles in the center of your eyes. They are usually the same size.

Anisocoria is a term that refers to an abnormal condition in which the pupils of the two eyes in the same individual are of different sizes. Normally, the size of the pupil is identical in both eyes.