The part of the eye that may be colored (e.g., brown, blue, green, or gray) is the

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The iris is the colored part of the eye that controls the amount of light that enters the eye by changing the size of the pupil. The retina is the light-sensitive membrane at the back of the eye, the sclera is the white outer layer of the eye, the choroid is the middle layer of the eye that contains blood vessels, and the cornea is the clear front part of the eye that helps focus light. None of these parts are typically colored.

The Part of the Eye That May Be Colored (E