Hallux’s i-Guide: Pupil

The pupil is a dark circular hole in the middle of the iris which allows light to enter the retina

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The size of the pupil is controlled by muscles.

When more light is needed, the pupil is made larger and when less light is needed, the pupil is made smaller – just like the shutter of a camera!

Next: Iris

> Visit Professor Hallux’s i-Guide homepage
> Download the free i-Guide podcast from iTunes

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