New Findings on Astronaut Vision Loss
Approximately 20 percent of astronauts living on the International Space Station have reported post-flight vision changes. Previous research, published in the October 2011 issue of Ophthalmology, identified a possible link between the reported vision changes and increased intracranial pressure caused by shifts in bodily fluids from the lower extremities to the upper part if the body, due to microgravity. This may still be part of the problem, but the new study shows there may be other contributing factors. The findings may provide evidence to help understand why some crew members suffer vision-related problems, while others do not.