[[1]] is a dark muscular diaphragm that controls the size of the pupil.

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Detailed Solution

Iris is a dark muscular diaphragm that controls the size of the pupil.
Iris is a dark muscular diaphragm situated just behind the cornea. It has a small opening in the middle of the pupil, through which light enters the eye. Iris is the name for the thick, muscular diaphragm that regulates pupil size. The front of the eye is made up of the cornea, a transparent layer. The central layer of the eye contains the ciliary muscle, a ring of smooth muscle that controls the flow of aqueous fluid.

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