Eyes on the Stars, Part Three of Three—Vision Care and the Mars Mission

In the meantime, Dr. Gibson and NASA colleagues have developed some hypotheses about space and changes of vision: “We do feel that a lot of these changes to the eye and to vision are due to the fluid shifts that occur in space flight. In a weightless environment the fluids tend to shift towards the head, we call it a cephalic fluid shift, so if you look at pictures of astronauts in space they get kind of a puffy face, they get kind of the bird leg syndrome, their legs get skinny and their face gets kinda puffy, and that’s because the fluids in the body are redistributed to the upper body. And we think that the fluid distribution to the head could cause some or all of these changes.

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