Here is Chris Hadfield on how eyesight is affected in space.

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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.

Read the full article from ASC-CSA.gc.ca

Dr. Dexter's Take

Astronaut, Chris Hadfield, explains in this video that some people will report changes in vision while in space. In order to better understand ocular changes that may occur with zero gravity, astronauts now measure each other's intraocular pressures with a Tonopen, and transmit images of their fundus with an ophthalmoscope, as well as ultrasound images of the ocular structures. This is one of those things that you never probably even thought of, but it would be interesting to see the data once analyzed!