Structure & Function of the Eye - Teaching Students with The iris is the pigmented tissue lying behind the cornea that gives color to the eye and controls the amount of light entering the eye by varying the size of the papillary opening. It functions like a camera. The color of the iris affects how much light gets in. Anatomy and Structure of the Eye | BrightFocus Foundation Lens: The transparent structure suspended behind the iris that helps to focus light on the retina; it primarily provides a fine-tuning adjustment to the primary focusing structure of the eye, which is the cornea. Macula: The portion of the eye at the center of the retina that processes sharp, clear straight-ahead vision.
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