What does it mean if your pupils are very small?

The pupil is the part of your eye that controls how much light gets in. In bright light, your pupils get smaller (constrict) to limit the amount of light that enters. In the dark, your pupils get bigger (dilate). That allows more light in, which improves night vision. read more

The pupil is the central black- looking hole in the centre of your eye. It is the light sensitive aperture that controls the amount of light going into your eye. read more

The pupil is the opening in the center of the iris of the eye. A chief function of the pupil is to control the amount of light entering the eye. Two muscles, the sphincter and the dilator, control the size of the pupil in response to changes in light. The dilator muscle radiates out from the pupil like a star. read more

Small (constricted) pupils WebMD Symptom Checker helps you find the most common symptom combinations and medical conditions related to small (constricted) pupils. Click on the combination that matches your symptoms to find the conditions that may cause these problems. read more