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Mysterious Astronaut Eye Troubles Linked to Wonky Spinal Fluid

Long-duration spaceflight seems to mess with astronauts' vision and researchers think that cerebrospinal fluid in a microgravity environment could be to blame.

November 30, 2016
4:00 PM EST
This image from a 2012 study shows changes in the right eye of an astronaut. You can see a kink in the optic nerve as well as flattening at the back of the eye (Radiological Society of North America)
Canadian astronaut Bob Thirsk was one of the first astronauts to look at the eye problem situation, during his last spaceflight in 2012 (NASA)