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The iris, the visible colored part of the eye, is the most anterior portion of the uvea. Shaped like a flattened doughnut, it lies between the cornea and the lens and it is continuous with the ciliary body posteriorly. It's round central opening, the pupil, allows light to enter the eye.

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12y ago
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11y ago

The Iris regulates the light, it has a hole in the middle called the Pupil which becomes smaller when the muscles in the Iris contract, and larger when they relax.

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12y ago

Iris

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11y ago

pupil

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Q: What structure regulates the amount of light passing to the visual receptors of the eye?
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