After decades of collecting data about how astronauts' vision is affected by spaceflight, scientists have identified a set of microgravity-induced changes to the human eye known as Spaceflight-Associated Neuro-Ocular Syndrome, or SANS. This condition is considered a risk to human health in long-duration spaceflight.
Later this year, a SpaceX Falcon 9 rocket will hurl the Polaris Dawn mission of four crew members skyward for a privately-backed voyage of up to five days in Earth orbit. During their stay time circuiting our planet in a Crew Dragon capsule, the high-flying team is dedicating major time to probe health impacts on the body from their sojourn into space.
