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PTA Physical Therapy Assistant

Category - Data Collection

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How would the pupils react to light when there is an occulomotor (III cranial) nerve palsy?
  1. When showing light to the affected eye, there will not be any pupil reaction in both eyes
  2. When the light is shown to the affected eye, contra lateral eye pupil constricts
  3. When the light is shown to the normal eye, the pupil constricts on the same side
  4. Both A and C
  5. Both B and C
Explanation
Answer: E - Both B and C (when the light is shown to the affected eye, the contra lateral eye pupil constricts, and when the light is shown to the normal eye, the pupil constricts on the same side).

When the light is shown to the affected eye, contra lateral eye pupil constricts because the normal side has an intact III cranial nerve. When the light is shown to the normal eye, the pupil constricts on the same side because of the intact III cranial nerve on that side reacts to light.

In optic (II cranial) nerve palsy, when showing light to the affected eye, there will be no reaction in the pupils of both eyes.
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