Astronaut feels space's toll on his body

It’s not really why he signed up to be an astronaut, but like it or not, Mike Barratt and his eyes have become a science project.

The eye charts he reads, the red drops that turn his eyes yellow and the ultrasounds being performed on him could determine whether he or any other astronaut ever journeys into deep space or sets foot on other worlds.
NASA’s new priority is how to protect astronauts from going blind on the years-long trip to get wherever they are going.
“I absolutely agree that this is our number one priority,” Barratt said.

MORE: http://lightyears.blogs.cnn.com/2012/02/10/astronaut-feels-spaces-toll-on-his-body/?hpt=hp_bn1

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