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Vision Problems For Some Returning Astronauts
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."
... which would be unprofessional and probably reckless behaviour on behalf of the astronauts. One can understand the emotional reasons, but the huge efforts made for their safety would be in vain if they are not honest about their capabilities.
That's all nice and logical from the armchair, but take it from their point of view. They're Air Force pilots, who've spent years, maybe decades to get tht shot. Knowing that Deke Slayton was grounded for the better part of a decade for a minor heart flutter, you're simply not going to take the chance if you think it's not stopping you from doing your job. That's part of "Right Stuff" mentality. The very kind of personality you recruit for the job tends to foster that kind of disposition. It would be very interesting to get the Russian data on this... they're the endurance bears when it comes to long stays in space.