Solving a Medical Mystery Crucial to Future Space Travel

Astronauts often wrestle with blurry vision during spaceflight and this problem is jeopardizing longer missions to Mars, according to a report in Medscape.

Half of the astronauts on the International Space Station have already experienced reduced visual acuity, most noticeable at near distances. And specialists here on Earth have observed combinations of choroidal folds, disc edema, and cotton wool spots in their eyes.

On the space station, the astronauts test themselves or one another, pulling each diagnostic instrument from a tangle of wires and equipment that covers every surface inside the station.

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