Space travel changes you, and not in a good way. If this is the effect of only a couple weeks, it definitely puts a damper on the idea of attempting a ten-year voyage to another galaxy. The Irish Times reports:
Brain scans of Nasa astronauts who have returned to Earth after more than a month in space have revealed potentially serious abnormalities that could jeopardise long-term space missions.
Doctors examined 27 astronauts who had flown long-duration missions and found a pattern of deformities in their eyeballs, optic nerves and pituitary glands that remain unexplained.
Astronauts who had flown on the Space Shuttle and International Space Station reported changes to eyesight, with some seeing worse and others better. Brain scans revealed that seven of the 27 astronauts had a flattening of the back of one or both eyes.