It is currently Sat Dec 03, 2016 9:53 am
Something strange has been happening to people who stay too long in space: The backs of their eyeballs start to flatten. Spider-web-like marks called choroidal folds crisscross the thin layer of blood vessels and connective tissue that surround their retinas. Their vision goes blurry, their optic nerves become inflamed. The damage can last long after the astronauts return to Earth. And scientists haven't been able to explain why.
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