Schreiber K, Schor C, 2004, "The influence of eye movements on retinal correspondence and the theoretical horopter" Perception 33 ECVP Abstract Supplement
The influence of eye movements on retinal correspondence and the theoretical horopter
K Schreiber, C Schor
The theoretical point horopter is traditionally defined as all the locations in space projecting onto identical retinal points in the two eyes. For gaze directions within the horizontal plane, it consists of the frontal parts of the Vieth - Müller circle and a vertical line. For gaze directions outside of this plane, ocular torsion described by Listing's law changes the shape of the horopter into a spiral, first described by Helmholtz. To quantify the effect of eye position changes on retinal correspondence, we extend the definition of the horopter to encompass all those points in space that lie closest to the projection rays originating from identical retinal points. This horopter surface exists for every gaze position and all visual angles. By restricting the amount of residual disparity for points on this horopter, we obtain a surface patch for which the deviation from projection onto identical points stays below this disparity limit. The retinal projection area of this patch is a measure of retinal correspondence and can be used to quantify the effect of eye movements. We apply this tool to an analysis of 3-D binocular eye movements and show that by obeying L2 rather than Listing's law the oculomotor system optimises retinal correspondence.
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