In optical terms, the anatomical pupil is the eye's aperture and the iris is the aperture stop. The image of the pupil as seen from outside the eye is the entrance pupil, which does not exactly correspond to …

Oct 4, 2022 · 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.

Dec 4, 2024 · 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...

Mar 21, 2026 · 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 …

: the usually round opening in the iris that contracts and expands to control the amount of light entering the eye.

Jan 6, 2026 · 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.

All pupils are expected to attend school assembly. The government has pooh-poohed the idea that primary schools will begin to select pupils. The vast majority of pupils attend state-funded schools. …

Jul 6, 2023 · 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.

The pupils are generally equal in size. They constrict to direct illumination (direct response) and to illumination of the opposite eye (consensual response). The pupil dilates in the dark. Both pupils …

Feb 26, 2019 · Typically, the pupils appear perfectly round, equal in size and black in color. The black color is because light that passes through the pupil is absorbed by the retina and is not reflected …