Which part controls the amount of light entering the eye?

Study for the Visual Impairment Education Certification Test. Explore multiple choice questions, with hints and explanations for each. Prepare thoroughly!

Multiple Choice

Which part controls the amount of light entering the eye?

Explanation:
Light entering the eye is regulated by the iris, the colored ring around the pupil. It controls the amount of light by changing the pupil’s size: in bright light the iris contracts to make the pupil smaller, limiting light; in dim light the iris relaxes to widen the pupil, allowing more light to enter. The pupil is the opening through which light passes, but the iris adjusts that opening. The lens then focuses the incoming light onto the retina, which detects it.

Light entering the eye is regulated by the iris, the colored ring around the pupil. It controls the amount of light by changing the pupil’s size: in bright light the iris contracts to make the pupil smaller, limiting light; in dim light the iris relaxes to widen the pupil, allowing more light to enter. The pupil is the opening through which light passes, but the iris adjusts that opening. The lens then focuses the incoming light onto the retina, which detects it.

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