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A member asked:
What happens when the iris gets smaller and the pupil gets bigger?
A doctor has provided 1 answer
Pupil is iris hole: The pupil is the absence of the iris. In other words, when the pupil constricts, the aperture which allows light to enter the eye is made smaller as the iris muscle constricts. When the pupil dilates, the iris dilator muscle pulls the iris towards its root. This is a lot like drawing a curtain open-it bunches up on the side. The pupil is thus not an anatomic structure; it's where the iris isn't.
Answered 6/6/2015
5.5k views
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