SCANNER FOR TRAC
Bruce Wilson, Richard D. Jones, Philip J. Bones, Tim Anderson · 1996
2 3 Abstract - A novel system has been developed to provide non- invasive and simultaneous measures of horimtal, vertical, and torsional (rotation about the visual axis) movements of the eye. It uses a flyingspot laser scanner to selectively image landmarks on the eye. A horizontal scan through the centre of the pupil locates the left and right edges of the pupil allowing horimtal eye position to be estimated. Similarly, vertical eye position is estimated from a vertical scan through the pupil. A circular scan records striations on the iris from which torsional movement can be estimated from cross-emelation of successive circular scans. The ient can measure eye movements with a bandwidth of 25 Hz through a range of movement in excess of MI horimtally and m vertically. Prehnhary trials have demonstrated the feasibility of using a flying spot scanner to track eye movements. It should prove a valuable td for the investigation of eye movements in neurological disorders.