New Findings on Astronaut Vision Loss Could vision changes
experienced by astronauts be linked to a vitamin B-12 or folate
deficiency? While investigating the vision changes recently
identified in astronauts, nutritional assessment data showed
similarities to symptoms that occur with vitamin deficiencies,
according to a new study published in the March edition of The
Journal of Nutrition 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