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Pupil refers to the dark circular opening in the center of the iris of the eye.
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It controls the amount of light entering the eye by shrinking or dilating in response to surrounding light conditions.
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This is achieved through the action of the iris muscles, allowing the pupil to constrict or expand accordingly.
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Pupil size not only regulates the amount of light reaching the retina but is also influenced by various emotions and neurological factors.
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Eye examinations often involve the measurement and evaluation of pupil size and reaction, which can provide insights into overall eye health and conditions affecting the nervous system.
