Ocular vergence measurement in projected and collimated simulator displays

The purpose of this study was to investigate electrooculography (EOG) as a measurement of ocular vergence in both collimated and projected simulator e nvironments. The task required participants to shift their gaze between a c entral fixation point and a target appearing at one of three eccentricities . EOG was effective in recording ocular vergence. The EOG results were simi lar between collimated and projected displays, except for differences in ve rgence changes during lateral movement of the eyes, and ocular excursions d ownward elicited a greater EOG response than the reverse upward movement. T he computer-based technique of recording vergence was found to produce meas urable traces from a majority of participants. The technique has potential for further development as a tool for measuring ocular vergence in virtual environments where methods that require the wearing of head-mounted apparat us to track ocular structures (e.g., the pupil), which cannot be worn at th e same time as a flight or flight-simulator helmet, are unsuitable.