Exercise-induced homonymous quadranopsia after head trauma.

• Vol 9 • January 2007 46 Exercise-induced vision disturbances are uncommon. Most reports in the literature describe patients with either a vascular or demyelinating disorder. Uhthoff’s phenomenon is a classic example, commonly described in patients with multiple sclerosis. In 1971, Fisher [1] reported a 56 year old man who experienced episodes of bilateral altitudinal visual loss induced by running and mowing the lawn. The patient was found to have bilateral occlusion of the internal carotid arteries. An additional study describing exercise-induced visual loss was conducted by Shah et al. [2], in which three young patients with congenital or juvenile-onset glaucoma presented with visual loss occurring during exercise. Reports of this phenomenon in young healthy people are rare. In 1989, Imes and Hoyt [3] reported six cases of healthy young adults, without a history of migraine, who experienced a variety of transient visual events precipitated by exercise. To the best of our knowledge, there are no reports in the literature regarding visual field defects induced by exercise in otherwise healthy adults. We describe a case of a 27 year old healthy young man, without a history of migraine, who experienced recurrent visual field defects precipitated by exercise since an event of head trauma 7 years earlier.