Astronaut Vision Changes in Space, Pose Risks for Mars Exploration

Reports indicate that 70 percent of astronauts on extended ISS missions develop vision issues linked to spaceflight-associated neuro-ocular syndrome (SANS). The condition, caused by fluid shifts in microgravity, leads to optic nerve swelling, vision impairment, and structural eye changes. While symptoms often reverse upon return to Earth, the long-term effects remain ...

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