Disorder of conjugate lateral gaze in which the affected eye shows impairment of adduction
Aetiology
Injury/dysfunction in the medial longitudinal fasciculus (tract which acts as the central connection for the oculomotor nerve, trochlear nerve, and oculomotor nerve)
In younger patients, MS is a common cause
Older patients generally have a vascular aetiology (stroke)
Clinical features
Presents with ipsilateral impairment of the adducting eye and nystagmus in the abducting eye
