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Astronauts have found that their vision tends to get worse after being in space for long periods of time

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Chris Hadfield on how eyesight is affected in space

2013-04-09 - To better understand how vision is impacted in the space environment, astronauts use onboard medical instruments like the tonometer to examine the health of eyes. Commander Chris Hadfield gives us an inside look at these instruments and demonstrates how they work.

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