NASA has of course long been monitoring the affects of spaceflight on astronauts' health, but a recent study sponsored by the space agency is now shedding some new light on one potentially significant problem: their eyesight. While the study only involved seven astronauts, all reported that they suffered some degree of blurry vision while on the space station for more than six months, and some reported that the effects persisted for months after they returned to Earth. The study also found specific abnormalities in all of the astronauts affected, including changes in tissue, fluids, nerves and other structures in the back of the eye. Those problems are all relatively minor and correctable, but researchers are now also taking
