GED Science Practice

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Which part of the eye is responsible for controlling the size of the pupil?

  1. Cornea

  2. Retina

  3. Iris

  4. Sclera

The correct answer is: Iris

The iris is a circular, colored structure located behind the cornea and in front of the lens. It works like a shutter on a camera, adjusting the amount of light entering the eye by controlling the size of the pupil. The cornea primarily focuses light, the retina detects light, and the sclera is the protective outer layer of the eye, therefore none of these options are responsible for controlling the size of the pupil.

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