Effect of light on pupils

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Prepare for the NREMT AEMT Test. Study with flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready for your exam now!

Multiple Choice

Effect of light on pupils

Explanation:
Bright light makes the pupils contract to limit how much light enters the eye, protecting the retina. This pupillary light reflex uses the parasympathetic pathway: light signals from the retina travel to the brain, triggering the Edinger–Westphal nucleus, which sends signals via the oculomotor nerve to the sphincter pupillae muscle, causing constriction (miosis). In dim conditions, the sympathetic system widens the pupil, but with more light, constriction is produced. That’s why the correct choice is that more light causes constriction.

Bright light makes the pupils contract to limit how much light enters the eye, protecting the retina. This pupillary light reflex uses the parasympathetic pathway: light signals from the retina travel to the brain, triggering the Edinger–Westphal nucleus, which sends signals via the oculomotor nerve to the sphincter pupillae muscle, causing constriction (miosis). In dim conditions, the sympathetic system widens the pupil, but with more light, constriction is produced. That’s why the correct choice is that more light causes constriction.

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