The pupil is the black area in the center of the iris, the colored
part of the eye. The iris controls the size of the pupil in response to light
outside the eye so that the proper amount of light is let into the eye.
Light passes through the pupil to the back of the eye, where an
image is formed of what the eye is looking at.
Kathleen Romito, MD - Family Medicine & Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology
How this information was developed to help you make better health decisions.