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The iris is the colored portion of the eye containing muscles that control the size of the pupil. By adjusting the pupil's diameter, the iris regulates the amount of light that enters the eye.

Iris

The pupil is the small opening in the eye through which light passes. Its size changes in response to varying light levels and emotional arousal. In low light, the pupil dilates (expands) to allow more light in, whereas in high light, it constricts (shrinks) to reduce light entry.

Pupil

A person walks out of a dark movie theater into the bright afternoon sun. Which of the following describes the immediate response of the muscles within the colored portion of their eyes and the primary reason for this change?

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