NASA investigating blurry vision of astronauts

September 21, 2011 4:06:34 PM PDT
NASA is looking into why some astronauts are suffering vision problems after spending time in space.Astronauts who have lived on the International Space Station for long periods of time have reported blurred vision. Research shows the more time they spend in space, the more likely they are to have problems. NASA doesn't know why astronauts have blurry vision, but the agency says it is investigating the issue.