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Stroke, Vol 20, 554-558, Copyright © 1989 by American Heart Association

ARTICLES

Bilateral loss of vision in bright light

DO Wiebers, JW Swanson, TL Cascino and JP Whisnant
Department of Neurology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905.

We describe four patients with episodic bilateral vision impairment related exclusively to light exposure. Each had angiographically documented bilateral high-grade stenosis or occlusion of the internal carotid arteries. This phenomenon appears to be related to bilateral simultaneous retinal ischemia delaying regeneration of visual pigments in the pigment epithelial layer. It must be distinguished from bilateral occipital lobe ischemia caused by vertebrobasilar system disease.

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