Abstract
Over the last decade, the National Aeronautics and Space Administration's (NASA) Space Medicine Division has documented a variety of unusual physiological and pathological neuro-ophthalmic findings in astronauts during and following long duration space flight. These ndings include optic disc swelling, globe flattening, choroidal folds, and hyperopic shifts in refraction. Cephalad fluid shift has been proposed as a possible unifying etiology, but the specific mechanism responsible for these changes remains obscure. This manuscript reviews the history, clinical findings, and potential neurophysiological etiologies for spaceflight-associated neuro-ocular syndrome.
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