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In humans, the pupil is circular, but its shape varies between species; some cats, reptiles, and foxes have vertical slit pupils, goats and sheep have horizontally oriented pupils, and some catfish have annular types. [3] 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 ...
The pupil is the black hole in the center of the colored part of your eye (iris). The pupil is the pathway that lets light get to your retina.
There's an average pupil size that's considered normal. Measured in millimeters, your eyes' pupils can change based on light, medications, and even emotions.
The meaning of PUPIL is a child or young person in school or in the charge of a tutor or instructor : student.
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.
Pupil Size The size of the pupil varies from person to person. Some people have large pupils, and some people have small pupils. Also, pupil size changes with age — children and young adults tend to have large pupils, and seniors usually have small pupils.
WebMD offers an eye-opening look at your pupils and what they can tell you.
"Miosis" is a medical term that describes the constriction of the pupils. Learn its causes, symptoms, and how to treat it.
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
Human eye - Pupil, Iris, Retina: 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. This is bilateral, so that even if only one eye is exposed to the light, both pupils ...