Tom Marshburn, NASA, and Chris Hadfield, Canadian Space Agency (IMAGE)

NASA/Johnson Space Center

Tom Marshburn, NASA, and Chris Hadfield, Canadian Space Agency

Caption

Expedition 34/35 Flight Engineer Tom Marshburn of NASA performs a tonometry eye exam on Chris Hadfield of the Canadian Space Agency in the Columbus module of the International Space Station. Tonometry measures intraocular eye pressure.

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Photo credit: NASA

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