Internuclear ophthalmoplegia is caused by lesions in the medial longitudinal fasciculus located in the midbrain or upper pons. It is characterized by impaired adduction of one eye and rhythmic nystagmus of the abducting eye when attempting lateral gaze. The side of the lesion corresponds to the affected eye's adduction, not the side with nystagmus.

1. MULTIPLE SCLEROSIS
INTERNUCLEAR
OPHTHALMOPLEGIA

2. Internuclear ophthalmoplegia is due to lesion in
one medial longitudinal fasciculus in the
mid brain or upper pons
On attempting lateral gaze there is rhythmic
nystagmus of the abducting eye with impaired
medial deviation of the adducting eye
the lesion is on the side of impaired
adduction ,not on the side of the nystagmus

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