Abstract
The various health benefits of physical exercise are well known. Regular, moderate exercise is included in every cardiovascular risk prevention program, as it has a protective effect on the cardiac vasculature. But intense, supramaximal exercise might have potentially adverse effects ranging from increased risk of vascular endothelial injury to sudden cardiac arrest. Acute bout of exercise at high-enough intensity can damage the endothelial cells in the systemic blood vessels. Exercise also affects the retinal and choroidal blood flow, but studies evaluating these effects are limited. Autoregulation, perfusion pressure, endothelial injury, hemoconcentration, and other systemic factors play a complex role in this. In a rare occurrence, we report two cases of sudden occlusion of retinal circulation involving the central retinal artery in one and the ophthalmic artery in the other, following acute, intense exercise in otherwise young, healthy persons. Extensive investigations revealed no other cause for the occlusion. Vision in the affected eye remained poor.
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