Scientists have pinpointed why the vision of astronauts deteriorates after long trips in space.
In a study conducted at UT Southwestern Medical Center, researchers found that constant intracranial pressure astronauts experience may be to blame.
For astronauts, the intracranial pressure in zero-gravity conditions is higher when standing or sitting than it is on Earth, but lower during sleep than it is on Earth.
Using a vacuum device to lower pressure for part of each day might prevent the problem.
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