Why does your pupil size change? Find out why this happens and whether it may or may not be related to an eye disorder.
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. If you're in a bright environment, the pupil will shrink in size to allow less light to enter the eye. In dark surroundings, the pupil expands to let more light in. 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. Past physical injuries to the eye or the head can also have a long-lasting impact on the average pupil size.Variations in lighting conditions are the most common reason for a change in pupil size. The pupils in both eyes respond independently to bright or dim light, so it's possible for one pupil to expand or contract while the other remains stable. Pupils also make small adjustments in size to help you focus better on a close or distant object.Processing or experiencing emotions leads to changing pupil sizes too. The pupils slightly expand or dilate every time you feel excited or nervous. Seeing strong emotional cues like a person laughing or crying could also cause differences in pupil size. In general, pupils tend to grow wider if you vividly feel a positive or negative emotion. The pupils can also widen if you're concentrating hard on a particular task like solving a math problem or retrieving a memory.
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