Astronaut Vision Changes in Space, Pose Risks for Mars Exploration https://ift.tt/tuWw7Yv Astronaut Vision Changes in Space, Pose Risks for Mars Exploration A significant number of astronauts spending extended time aboard the International Space Station (ISS) have reported changes to their vision, raising concerns for future deep-space missions . Reports indicate that 70 percent of astronauts who have spent between six to twelve months in microgravity have experienced noticeable shifts in eyesight. Symptoms linked to spaceflight-associated neuro-ocular syndrome …