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 …

6 days ago · 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.

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...

Dec 29, 2025 · 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 …

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 …

Apr 29, 2023 · The eye has many parts, including the cornea, pupil, lens, sclera, conjunctiva and more. They all work together to help us see clearly. This is a tour of the eye.

3 days ago · Discover everything about the pupil of the eye: structure, function, light response, and what pupil changes reveal about your health. Expert guide to understanding this vital part of vision.

Oct 30, 2023 · Structure of the eyeball seen in a transverse section. The pupil is the small black circle located in the center of the eyeball. Surrounding the pupil is the colored part of the eye, the iris. The …

The human pupil is typically round in shape, but in some animals, the shape can vary (for example, cats have slit-shaped pupils). The round shape ensures that light is evenly distributed as it passes …