Neuro-ophthalmology & Squint · NEET PG Preparation Ophthalmology
A 24-year-old patient has horizontal diplopia. On looking to the left, the right eye fails to adduct, while the left eye abducts with nystagmus. Conv…
Practice question from Neuro-ophthalmology & Squint (NEET PG Preparation Ophthalmology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-1A41DC
A 24-year-old patient has horizontal diplopia. On looking to the left, the right eye fails to adduct, while the left eye abducts with nystagmus. Convergence is preserved. Where is the lesion?
- A.Left medial longitudinal fasciculus
- B.Right medial longitudinal fasciculusCorrect answer
- C.Right abducens nerve
- D.Left oculomotor nerve
Solution
This is right internuclear ophthalmoplegia. A lesion of the right medial longitudinal fasciculus causes impaired right-eye adduction during left gaze, with abducting nystagmus of the left eye. Convergence is typically spared because it uses a different pathway.
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