Nurse performs tonometry examination, which measure the tension of the eyeball, during an employee's arnual physical examination given by MSFC Occupational Medicine Environmental Health Services under the Center Operations Directorate.

ISS030-E-200591 (6 April 2012) --- In the International Space Station?s Destiny laboratory, NASA astronaut Dan Burbank (left), Expedition 30 commander, uses the Health Maintenance System Tonometry payload to perform an intraocular pressure test on NASA astronaut Don Pettit, flight engineer. The activity was supervised via live Ku-band video by medical ground personnel.

ISS034-E-035949 (21 Jan. 2013) --- NASA astronaut Tom Marshburn (right), Expedition 34 flight engineer, performs a Tonometry eye exam on Canadian Space Agency astronaut Chris Hadfield, flight engineer, in the Columbus laboratory of the International Space Station. The purpose of this exam is to measure intraocular eye pressure.