Astronauts’ eyeballs deformed by long missions in space, study finds:
They were alerted to the issue when astronauts who had flown on the space shuttle and International Space Station reported changes to their eyesight, with some seeing worse and others better than they had before.
Brain scans revealed that seven of the 27 astronauts had a flattening of the back of one or both eyes. By making the eyeball shorter, this made the astronauts more long-sighted, which in some cases had the effect of reducing or correcting their short-sightedness.
This could impact the nascent space tourism industry.