NASA Investigates Astronauts' Vision Changes During Long Space Missions
📷 Image source: images-assets.nasa.gov
NASA is delving deeper into the puzzling phenomenon of vision impairment experienced by astronauts during extended stays on the International Space Station (ISS). Known as Spaceflight-Associated Neuro-Ocular Syndrome (SANS), this condition involves structural changes in the eyes and optic nerves, potentially linked to prolonged exposure to microgravity. Symptoms include swelling of the optic disc, flattening of the eyeball, and blurred vision, with some cases persisting even after returning to Earth.
Recent studies suggest that the redistribution of bodily fluids in zero gravity may increase intracranial pressure, affecting the optic nerve. NASA’s ongoing research includes advanced imaging techniques and pre- and post-flight health assessments to better understand and mitigate these risks. Collaborations with international space agencies aim to develop countermeasures, such as specialized eyewear and modified exercise regimens, to protect astronauts’ vision during future long-duration missions to the Moon and Mars.
Additional findings from the European Space Agency (ESA) highlight similar concerns among European astronauts, reinforcing the need for global solutions. With crewed deep-space missions on the horizon, resolving SANS remains a critical priority for ensuring astronaut health and mission success.
