From www.space.com:

Researchers may now know why spaceflight is so hard on the eyes — and what to do about the problem.

The likely culprit is the lack of a day-night cycle in the pressure inside astronauts’ skulls, a new study reports. This finding, in turn, suggests a possible fix: the use of some sort of vacuum device to impose that cycle.

The microgravity environment is hard on the human body. For example, crewmembers aboard the International Space Station (ISS) have to exercise vigorously for several hours each day to keep their muscles and bones from wasting away.

The eyes suffer as well.

 

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Image Credit:     NASA

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