September 20, 2011 By Chad Vander Veen
Blindness. Specifically NASA has found that long-term exposure to microgravity seems to cause blurred vision in some astronauts. According to the Orlando Sentinel, one NASA survey of 300 astronauts found that "nearly 30 percent of those who have flown on space shuttle missions – which usually lasted two weeks – and 60 percent who've completed six-month shifts aboard the station reported a gradual blurring of eyesight."
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