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Study: long-duration spaceflight may damage eyesight
Posted: Thu, Mar 15, 2012, 8:32 AM ET (1232 GMT) Some astronauts who have spent extended time in space have suffered optical abnormalities that could affect their eyesight, scientists reported this week. In a paper published in the journal Radiology, researchers said a third of astronauts who spent time on long-duration missions to the ISS experienced symptoms such as flattening of the eyeball and bulging of the optic nerve that can affect eyesight. The cause of these symptoms isn't clear but is thought to be linked to exposure to weightlessness.
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