Miosis
Miosis of the eye refers to having small or constricted pupils. The condition is also called pupillary miosis. Pupils are the black circles in the middle of your eyes. With miosis, the muscles of your iris (the colored part of your eye) tighten around your pupil. These muscles control whether your pupils are large or small. Another name for miosis is pinpoint pupils. Typically, your pupils get bigger or smaller when light enters your eyes. When there’s a bright light, your pupils get smaller. When it’s dark, your pupils get larger. If you have miosis, your pupils stay small even if the light changes. The size of your pupils also changes when you look at an object that is close to you. Pupils get smaller when are focused on something that is closer rather than farther away. Miosis of the pupils can be on one side (unilateral) or both sides (bilateral). These conditions can also be thought of as monocular (one eye) and binocular (two eyes).