Last updated July 10, 2018 at 10:58 am
It’s caused by your brain moving up.
Too much time in space can make your eyes go flat, scientists have warned.
It happens to some astronauts, and appears to be caused by the brain moving upwards and pulling back on the nerves in the eyes.
It’s a symptom of a condition known as Space flight-Associated Neuroocular Syndrome (SANS), which is characterised by increased optic nerve sheath diameter and globe flattening.
The researchers, from University Sorbonne Paris Cité, France, suggest that it may indicate the effect of space flight on brain position and spinal fluid pressure.
“Our findings suggest that eyes are portals into effects on the brain during space flight,” they write in the journal JAMA Ophthalmology.
They also warn that wearing a “penguin suit” that helps counteract the effects of zero gravity on the body might make this condition worse.
