We Don’t Know Why Space is Bad for Our Eyes

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Since the 1980s, NASA scientists have known that space travel can negatively impact your vision, but they're still unsure exactly what causes it. Symptoms of SANS (spaceflight-associated neuro-ocular syndrome) can worsen over time, so if we're going to start shipping humans to Mars, we've got to figure out how to prevent or mitigate the symptoms.

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