Mysterious syndrome impairing astronauts' eyesightNASA Astronaut John Phillips began experiencing eye problems during ISS Expedition 11, a six-month mission in 2005. Visual Impairment Intracranial Pressure syndrome (VIIP) is named for the leading theory to explain the syndrome. The only proven methods of measuring intracranial pressure are invasive: a lumbar puncture or drilling a hole into the skull. Phillips became the first widely recognised case of a mysterious syndrome that affects 80 per cent of astronauts on long-duration missions in space. The theory that fluid builds up in the skull during space flight hasn't actually been tested.

Source: Stuff July 11, 2016 00:45 UTC