The quantum efficiency (QE) and flat field characteristics of back-illuminated 1024 X 1024 Tektronix CCDs have been measured in the extreme ultraviolet (EUV) between 44 and 1216 angstroms. These CCDs have been fabricated for the focal plane detector of the Extreme-ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observing spacecraft. The back-side surface of the EIT CCDs have been specially processed to enhance and stabilize the EUV QE. All requirements for QE are met by these devices, although a poorly understood variation of QE with temperature will complicate data analysis.