What to Know About Normal Pupil Size

Pupils are the black-colored circles in your eyes that allow light to enter. The pupil is surrounded by the colored part of the eye called the iris. The iris is responsible for adjusting the diameter of the pupil to let more or less light in. The pupil is round in shape and appears black because the light striking it's absorbed into deeper parts of theThe size of your pupil keeps changing throughout the day according to the lighting conditions around you.

Your pupil's size can also change depending on whether you're looking at nearby or far-away objects. If the pupil doesn't vary in size in response to changes in lighting and gaze, there might be something wrong. In an adult, the pupil's diameter usually varies between 2 and 4 millimeters in bright light and between 4 and 8 millimeters in dark.

The maximum pupil size also varies significantly among different age groups. For example, the pupil is the widest around age 15, after which it begins narrowing in an inconsistent fashion after age 25.Pupil size can change dramatically in response to not only light but also your emotions, periods of intense concentration, recently eaten foods, prescription and recreational drugs, and underlying diseases or disorders.

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