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What is the pupil?

Your pupil is the dark circle at the center of the colored part, or iris, of your eye. Normally, your pupils will get bigger in the dark to let in more light, and smaller in bright light. This is called dilation, and it's controlled by the muscles in your iris. Pupils that are cloudy or white, do not respond to light, or are different sizes can signal an eye condition or other medical problem, and the person should see a doctor.
pupil of the eye
The pupil is the central region of the eye, which appears black in color, although it is translucent. The pupil is surrounded circumferentially by the iris, which adds color to the eye. The pupil acts to transmit light to the back of the eye, the retina, which then focuses the light and images to transmit to the brain.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.