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Which part of the eye dilates and contracts to control the amount of light reaching the inner eye?

Which part of the eye dilates and contracts to control the amount of light reaching the inner eye?
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Which part of the eye dilates and contracts to control the amount of light reaching the inner eye?

User Boldijar Paul
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It is the Iris I believe. It controls the diameter and size of the pupil, controlling the amount of light reaching the retina.
User MacKentoch
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