An investigation is underway to determine why some astronauts have been experiencing loss of vision.
New research in to the mysterious loss of eyesight reported by some astronauts has revealed that the problem could be related to a Vitamin B-12 or folate deficiency. 20 percent of astronauts who have spent time aboard the Internal Space Station have reported at least some level of eyesight change following their stint in space.
Scientists studying the phenomenon had suggested that an increase in intracranial pressure due to shifts in body fluids in a weightless environment could account for the symptoms, but a new nutritional assessment based on blood and urine samples taken before and after the astronauts' time in space has revealed that vitamin deficiency may be a more likely candidate.
"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."
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