ABSTRACT
The measurement of 3D eye position is an important investigative tool in the understanding of the human vestibular and oculomotor systems. The subject is asked to look at a fixation point positioned directly ahead. This eye orientation is taken to be the reference position for all subsequent calculations. The ever increasing rate of development of computer and image processing hardware ensures that these limitations will soon be overcome, enabling video-based systems to measure 3D eye position non-invasively with a temporal and spatial resolution comparable to the scleral search coil technique. The reference position of the eye is defined as the position where the center of the pupil lies on the hj axis. Horizontal and vertical eye position is calculated from the pupil center, which can be determined in a number of ways, such as center of mass or fitting an ellipse to the pupil boundary.
