astroengine writes "A newly discovered affliction has some doctors wondering if astronauts traveling to Mars could have problems with their eyesight by the time they got there. About one-third of U.S. crew members aboard the ISS return with impaired vision, one case of which was permanent. The reason for the late discovery of this mysterious affliction is the reluctance of astronauts on active service to come forward — the risk of being grounded after complaining of blurry vision is considered too great."
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