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PIX4641178: Thomas Pesquet in the International Space Station (ISS) - Thomas Pesquet in ISS: Peggy Whitson measures Thomas Pesquet's eye pressure for the Fluid Shift experience. Some astronauts have altered vision during and/or after flight and this phenomene is still not explained precisely, but fortunately it is reversible. For International Space Station research Peggy Whitson is measuring the pressure of Thomas Pesquet eyes for the Fluid Shift experiment. A lot of research into astronauts eyes is done because some astronauts suffer a change in visual acuity during and after spaceflight but fortunately it does not last. / Bridgeman Images