This small yellow card, now placed in a commemorative presentation, was used by astronauts Frank Borman and Jim Lovell during the Gemini VII mission to record their results from the inflight vision test experiment. The first part of the S-8/D-13 experiment required astronauts to insert this card into the vision tester, look into the device, and record their results on the card before looking out the window of the spacecraft at specific locations. In the early days of long duration spaceflight, researchers wanted to determine what effects if any the weightless environment had on different bodily functions such as vision.