Doctor Launches Vision Quest To Help Astronauts' Eyeballs

"Spending time in space changes people: Not just their outlook on life, but also their eyesight."

"For years, a North Texas doctor has been trying to find out what is causing this vision change among astronauts. His latest research provides some clues — and connects astronauts on the International Space Station, cancer patients on a roller coaster plane flight, and high-tech sleeping sacks."

"After spending six months on the International Space Station, Michael Barratt had a strange request when he finally stepped foot on Earth."

"He wanted a spinal tap."

"Barratt isn't a masochist, he's a NASA astronaut. While flying hundreds of miles above Earth in 2009, he noticed his vision was changing. He was struggling to read manuals and checklists."