When you shine a light into one pupil, the normal reaction of the other pupil should be to:

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Study for the Nassau County EMT Test. Prepare with flashcards and multiple-choice questions. Each question is accompanied by hints and explanations. Get ready for your exam!

Multiple Choice

When you shine a light into one pupil, the normal reaction of the other pupil should be to:

Explanation:
When light hits one eye, both pupils constrict in a normal pupillary light reflex. The retina sends a signal to the brain that activates the parasympathetic nerves to both eyes, causing the iris sphincter muscles to contract and the pupils to become smaller. So the other pupil should become smaller. The illuminated pupil also constricts. If the other pupil didn’t constrict, or if it dilated, that would indicate a problem with the reflex pathway. The reflex focuses on constriction, not movement.

When light hits one eye, both pupils constrict in a normal pupillary light reflex. The retina sends a signal to the brain that activates the parasympathetic nerves to both eyes, causing the iris sphincter muscles to contract and the pupils to become smaller. So the other pupil should become smaller. The illuminated pupil also constricts. If the other pupil didn’t constrict, or if it dilated, that would indicate a problem with the reflex pathway. The reflex focuses on constriction, not movement.

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