What does "Pupil" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
A pupil is the black circular opening in the center of the eye. It controls the amount of light that enters the eye by changing its size; it gets bigger in dim light to let in more light, and smaller in bright light to let in less. The size of the pupil can also change in response to emotional states, such as fear or excitement. It's an essential part of the eye that helps us see in different lighting conditions.
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