An Emperor's Eye was an exalted level of Dark Side Adept loyal to Palpatine. It was higher in rank than the Emperor's Hand.
Their counterparts included the Emperor's Reach, Emperor's Voice, and the Emperor's Hands. The "Eyes" possessed a particular propensity for seeing into the Force and the future. Only two Eyes ever existed, Merili and Triclops. Palpatine entrusted the duty of training one of these two to the Prophets of the Dark Side.
The group was first mentioned in Star Wars: TIE Fighter, where the player character, Maarek Stele, was made into an Emperor's Eye by the Secret Order of the Emperor after completing an indeterminant amount of missions. Despite this, however, Stele's position as such is questionable due to other sources stating there weren't any other Emperor's eyes outside of Merili and Triclops.
- Evil Never Dies: The Sith Dynasties on Hyperspace
- The Complete Star Wars Encyclopedia