Answer :

The pupil's size controls how much light intensity falls on  the eye. When there is bright light present, the pupil shrinks to reduce the amount of light that reaches the eyes.

Pupils typically range in size from 2 to 8 mm, according to the American Academy of Ophthalmology. The distance you are staring at affects the size of your pupils as well. Your pupils contract when you're concentrating on a nearby thing. Your pupils enlarge when something is far away.

The pupil, a circular opening inside the eye, controls how much light gets in. The size of the pupil shrinks with increasing light intensity, and increases with decreases light intensity.

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