Pupil - Wikipedia 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 the location and size of the physical pupil because it is magnified by the cornea
Pupil Function and Disorders That Affect It - Verywell Health The pupil is the opening located in the center of the iris of the eye It controls the amount of light that enters the eye so that you can see clearly The pupil size is controlled by muscles of the iris that narrow and widen the opening
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