Which muscle constricts the pupil in bright light?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which muscle constricts the pupil in bright light?

Explanation:
In bright light, the pupil shrinks because the circular sphincter pupillae muscle around the pupil contracts. This parasympathetic-driven action reduces the pupil size to limit the amount of light entering the eye, protecting the retina and helping with sharper vision. The dilator pupillae would pull the pupil open in dim light under sympathetic control, so it does the opposite. The iris houses these muscles and controls pupil size, but the ciliary muscle is involved in changing lens shape for accommodation, not pupil constriction.

In bright light, the pupil shrinks because the circular sphincter pupillae muscle around the pupil contracts. This parasympathetic-driven action reduces the pupil size to limit the amount of light entering the eye, protecting the retina and helping with sharper vision. The dilator pupillae would pull the pupil open in dim light under sympathetic control, so it does the opposite. The iris houses these muscles and controls pupil size, but the ciliary muscle is involved in changing lens shape for accommodation, not pupil constriction.

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