Back to today’s briefing

Story perspectives

NASA Reveals 70% of Astronauts Experience Vision Changes

7/20/2025

25 3

Summary

Story summary

NASA's groundbreaking research uncovers that nearly 70% of astronauts face vision changes, termed Spaceflight Associated Neuro-ocular Syndrome (SANS), after extended stays on the International Space Station. The culprit? Microgravity-induced fluid shifts that elevate skull pressure, impacting sight. This vital study seeks solutions for future Mars missions and aims to enhance vision treatments back on Earth.

1 of 1

Story summary

NASA's groundbreaking research uncovers that nearly 70% of astronauts face vision changes, termed Spaceflight Associated Neuro-ocular Syndrome (SANS), after extended stays on the International Space Station. The culprit? Microgravity-induced fluid shifts that elevate skull pressure, impacting sight. This vital study seeks solutions for future Mars missions and aims to enhance vision treatments back on Earth.