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Which part of the eye controls whether or not the pupil dilates or constricts?

Which part of the eye controls whether or not the pupil dilates or constricts?-example-1
User Dzezzz
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2 Answers

2 votes
I believe it is the iris!
User Kervin
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anyone correct me if i'm wrong, but I believe it is the iris?
User Navinrangar
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