Michael Hopkins, NASA, and Luca Parmitano, European Space Agency (image) NASA/Johnson Space Center Share Print E-Mail Caption Expedition 37/38 Flight Engineer Michael Hopkins of NASA performs ultrasound eye imaging in the Columbus laboratory of the International Space Station. European Space Agency astronaut Luca Parmitano assists. Credit Photo credit: NASA Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.