Several tools are available for the evaluation of nystagmus or eye movements, such as Frenzel glass, electronystagmography (ENG), and infrared video goggles. Although ENG is used as a quantitative examination for recording eye movements, it does not permit the recording of the torsional component of nystagmus. Videooculography (VOG) provides evaluation of all the three-dimensions of eye movements, including of the horizontal, vertical and torsional components. In addition, recent technological developments have improved VOG as a research and clinical tool. Progress has been made in the investigational capability of VOG, including the possibilities of performing quantitative evaluation of nystagmus, the visual stimulation test, filing system linkage, high-speed recording, and the video head impulse test (vHIT).
