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Small pupils can happen when you’ve had a stroke or when you’ve used opiates, among other reasons. Mydriasis is the name of the opposite condition, having dilated pupils.
Pupils are the dark-colored openings at the center of your eyes that let light in. Doctors can look at your pupils for clues about your health. The size of your pupils and how they react to...
A pupil is the opening created by the iris, which controls the amount of light that enters the eye. Learn about medical conditions affecting the pupils.
The amount of light entering the eye is restricted by the aperture in the iris, the pupil. In a dark room, a person’s pupils are large, perhaps 8 mm (0.3 inch) or more in diameter. When the room is lighted, there is an immediate constriction of the pupils, the light reflex.
Learn about the dark openings at the center of your eyes called pupils, how they react to light, and what changes in pupil size and shape can indicate about your health.
Understanding Pupils: What They Are and What They Can Tell About Your ...
The pupils are the parts of the eye that constrict and dilate in response to light, controlled by the iris. Pupil-related eye conditions include anisocoria, cataracts, miosis and Horner syndrome.
Feelings such as surprise, fear, or attraction can trigger the sympathetic nervous system, causing the pupils to widen. This response is linked to the body’s general state of alertness.