Space Blindness Could Hit Future Astronauts

"If NASA ever wants to send astronauts to Mars, it first must solve a problem that has nothing to do with rockets or radiation exposure," reports the OrlandoSentinel. "A newly discovered eye condition -- found to erode the vision of some astronauts who've spent months aboard the International Space Station -- has doctors worried that future explorers could go blind by the end of long missions, such as a multi-year trip to Mars." Read more.