"Those who travel to space are rewarded with a beautiful sight--planet Earth. But the effects of space travel on the human sense of sight aren't so beautiful," reports Medical News Today. "More than 30 percent of astronauts who returned from two-week space shuttle missions and 60 percent who spent six months aboard the International Space Station were diagnosed with eye problems. Two recent investigations examined mechanisms that may explain eye changes in spaceflight, help find ways to minimize this health risk to astronauts and eventually prevent and treat eye diseases on Earth." Read more.