A new study is looking at the effects of space travel on the eyes. Mice sent into orbit aboard the Discovery mission in 2010 showed immediate evidence of oxidative stress to their retinas up return to Earth. But they returned to normal after 7days on Earth. These observations suggest that oxidative stress in the retina and lens from space travel is at least partially reversible. But they said it’s a short study, so they still aren’t sure what an extended mission to Mars or an asteroid could mean for the human eye. They saythat the study does indicate that better technology be developed to protectastronauts eyes.