Visual Phenomena in Lesions of the Median Longitudinal Fasciculus

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Abstract
LESIONS of the median longitudinal fasciculus (MLF) rarely produce symptoms of visual dysfunction. Despite the dissociation of eye movement on horizontal gaze, with weakness of the adducting eye and monocular nystagmus in the abducting eye, diplopia is uncommon and oscillopsia which may occur with nystagmus is even rarer. We have recently observed three patients with the syndrome of a lesion in the MLF who had double and blurred vision, the latter in the form of oscillopsia. The visual distrubances occurred on horizontal gaze and in a direction which elicited the weakness of adduction and monocular nystagmus. The oscillopsia was only of one of the two images; the other image remained stationary. All three patients had dissociated eye movement and nystagmus. Report of Cases CASE 1.—A 42-year-old man had horizontal diplopia for a period of one year in 1950. Since then he has had "blurring" of vision on looking to

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