NASA astronaut Chris Cassidy, Expedition 36 flight engineer, performs a visual exam using an eye chart (out of frame) in the Destiny laboratory of the International Space Station.
ISS036-E-018265 (11 July 2013) — NASA astronaut Chris Cassidy, Expedition 36 flight engineer, performs a visual exam using an eye chart (out of frame) in the Destiny laboratory of the International Space Station.