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(Journal Article) |
Vision research 38 (6): 911-23 (1998)
Visual test of Listing's law during vergence.
R A Somani
,
J F DeSouza
,
D Tweed
,
T Vilis
ABSTRACT
A simple visual test was used to measure how much Listing's plane rotates as a function of the vergence angle. This test measured the elevation-dependent torsional disparity of horizontal and vertical lines during three tasks: vergence on a near target, vergence through prisms that remained fixed, and through prisms that rotated with eye elevation. Consistent with our previous search-coil measurements, the results here suggest that the angle between the Listing's planes of the two eyes is somewhat less than the vergence angle.