Japanese astronaut Takuya Onishi performs eye scans inside of the U.S. Destiny laboratory aboard the International Space Station.

Japanese astronaut Takuya Onishi performs eye scans inside of the U.S. Destiny laboratory aboard the International Space Station. Crew members' bodies change in a variety of ways during space flight, and some experience impaired vision. To help develop countermeasures, crew members record their visual health during and after long-duration space station missions.