More than half of American astronauts experience some vision changes and anatomical alterations to their eyes during and after long-duration space flight. Stuart Lee, lead scientist for the Cardiovascular and Vision Laboratory at NASA’s Johnson Space Center in Houston, explains the current on orbit investigations of Vision Impairment Syndrome, in which scientists are studying changes in the eye’s structure and function. The results of these studies may improve our understanding of how blood pressure in the brain affects eye shape and visual acuity, which could benefit people suffering from increased swelling and pressure in the brain or those confined to long-term bed rest.
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