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James Maxwell


Selected Abstracts

Research Interests:

Vergence eye movements Saccade-vergence interactions Noncomitant vertical phoria adaptation
Otolith-dependent adaptation of vertical skew Neurophysiology of binocular eye movements

Contact information:

James S. Maxwell
School of optometry
360 minor hall
University of california
Berkeley, ca 94720-2020
Phone: (510) 642-7710
Fax: (510) 643-5109



Maxwell, J.S. The interaction of saccades and vergence eye movements and the effect of vergence angle on the discharge rate of abducens neurons in the monkey. Ph.D. Thesis, University of Rochester, Rochester, NY, 1991.

Abstracts for selected publications

The upper plots show the average phoria for four subjects following training in the Purkinje eye tracker. The left-hand figure shows the result of training with a right hyperdisparity (right eye's image higher than the left's) in the upper field and a left hyperdisparity in the lower field for forty minutes. The right-hand plot shows the result of training with a right hyperdisparity in the right field and a left hyperdisparity in the left field. Phoria was measured by having one eye occluded while the other viewed an array of targets. The lower plots show eye alignment as predicted by a model of orbital mechanics (Orbit TM given a 75% palsy of the superior rectus (left figure) or superior oblique (right figure). These simulations demonstrate that one purpose of an eye-position-dependent eye-aligment adaptive mechanism would be to compensate for misalignments produced by palsies of the extraocular muscles.
Cliff is demonstrating the three axes of rotation that were used in this experiment (Please note that his head was not actually removed from his body). The head was stationary during training and testing.Why is Cliff wearing the stylish glasses?
Subjects (none of them were actually bald headed by the way) trained their vertical phorias by looking through an afocal magnifier with one eye. The magnifier was in front of one eye with the head rolled to the right and in front of the other eye when the head was rolled to the left. The magnification makes that eye's image appear higher than the other when viewing a target in the upper visual field and lower than the other when looking at a target in the lower field. After one hour of training the subjects' vertical phorias changed in a way that would eliminate the double vision initially introduced by the lenses.
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