Neuro-ophthalmology & Squint · NEET PG Preparation Ophthalmology
During the swinging-flashlight test, both pupils constrict when light is directed into the right eye, but the pupils paradoxically dilate when the li…
Practice question from Neuro-ophthalmology & Squint (NEET PG Preparation Ophthalmology), with the correct answer and a step-by-step solution.
easy · MCQ · Q-80F667
During the swinging-flashlight test, both pupils constrict when light is directed into the right eye, but the pupils paradoxically dilate when the light is moved from the right eye to the left eye. Which lesion best explains this finding?
- A.Right optic nerve lesion
- B.Left optic nerve lesionCorrect answer
- C.Right oculomotor nerve lesion
- D.Left facial nerve lesion
Solution
The left eye has a relative afferent pupillary defect because its afferent input is reduced. Light directed into the affected eye produces less bilateral constriction, so the pupils appear to dilate when the light is moved to that eye.
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