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Pupil - Wikipedia The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina [1] It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil
Pupil | Iris, Optic Nerve Retina | Britannica Pupil, in the anatomy of the eye, the black centre opening within the iris through which light passes before reaching the lens and being focused onto the retina The size of the opening is governed by the muscles of the iris, the coloured part of the eye These muscles rapidly constrict the pupil
Pupil Function and Disorders That Affect It - Verywell Health A pupil is the opening created by the iris, which widens and narrows to control the amount of light that enters the eye Pupil size can vary between people, but they should be round, equal in size, and contract or dilate at the same time
Pupil | definition of pupil by Medical dictionary Aperture within the iris, normally circular, through which light penetrates into the eye It is located slightly nasally to the centre of the iris Its diameter can vary from about 2 to 8 mm It is often slightly smaller in old age