NASA wants to find out why zero G impairs human eyesight
 

A previous NASA study proved that space can impair an astronaut's vision, which is a huge problem if we want to start sending humans to Mars. That's why the agency has launched a new study that aims to pinpoint the exact cause of "space vision" and...

http://www.engadget.com/2015/11/18/n...on-loss-study/