Mechanisms of three dimensional ocular control as revealed in patients with skew deviation.
Published: 2007
Language: eng
Number of pages: 76
ISBN-13: 9780494273944
Description: Our eyes rotate with 3 degrees of freedom---horizontally, vertically, and torsionally---but torsional control is poorly understood. We know that in many visual tasks torsion is not an independent variable, but is determined by horizontal and vertical eye position; this fact is called Donders' law. Specifically, torsion is a linear function of horizontal and vertical eye position; this is Listing's law. I studied the mechanisms of these laws by recording 3-D ocular coordination in healthy subjects and in patients with an acquired oculomotor disorder called skew deviation. I found that both laws were broken in the acute stage of the disorder, and that both were later restored, though the linear function relating torsion to the other dimensions remained abnormal. These findings suggest that the neural mechanisms underlying Donders' and Listing's laws are adaptive: they restore the laws when ocular control is disrupted by a central lesion.
Notes: Source: Masters Abstracts International, Volume: 45-06, page: 3065.

Thesis (M.Sc.)--University of Toronto, 2007.

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