Of all senses, it is visual perception that is predominantly deluded in Virtual Realities. Yet, the eyes of the observer, despite the fact that they are the fastest perceivable moving body part, have gotten relatively little attention as an interaction modality. A solid integration of gaze, however, provides great opportunities for implicit and explicit human-computer interaction. We present our work on integrating a lightweight head-mounted eye tracking system in a CAVE-like Virtual Reality Set-Up and provide promising data from a user study on the achieved accuracy and latency.