JAMA Study Finds 2nd 6-Month Space Mission Does Not Worsen Eye, Brain Changes
Updated
Updated · Medical Dialogues · Jul 7
JAMA Study Finds 2nd 6-Month Space Mission Does Not Worsen Eye, Brain Changes
1 articles · Updated · Medical Dialogues · Jul 7
Summary
A JAMA case series found astronauts and bed-rest participants showed no larger eye or brain structural changes after a second exposure than after their first.
The study tracked two roughly 6-month ISS missions or two 30- to 60-day head-down tilt bed-rest campaigns, measuring retinal thickness and lateral ventricular volume with imaging before and after exposure.
Researchers focused on changes tied to spaceflight-associated neuro-ocular syndrome, including optic disc oedema and ventricular expansion seen in long-duration missions.
The findings suggest physiological responses may be relatively consistent across repeat missions, helping space-medicine teams forecast risks for astronauts flying more than once.
Long-term functional effects remain unclear, and the authors said more research is needed to determine whether repeated exposures could still produce cumulative harm over time.