Motion visual evoked potentials and vergence in infantile esotropia.
Published: 2005
Language: eng
Number of pages: 107
Description: Children with infantile esotropia (IET) demonstrate asymmetric vergence and saccades to disparity vergence stimuli. To determine whether these subnormal vergence responses are related to abnormal cortical motion processing, eye-movements to disparity vergence stimuli and motion visual evoked potentials (MVEP) were recorded in six patients with IET. All patients demonstrated asymmetric MVEPs. Five patients were capable of initiating vergence eye-movements. These findings suggest that symmetry of MVEP is not associated with initiation of vergence. To determine the effect of central suppression scotomas on the prevalence of responses with saccadic eye-movements, disparity vergence stimuli with artificial monocular scotomas of various diameters were presented to subjects with normal binocular vision. The rate of responses with saccadic eye-movements increased with the diameter of scotoma. These results suggest that responses to disparity vergence stimuli in patients with IET could be attributed to the effect of suppression scotoma on the sensory input to the vergence control system rather than an inherent defect in the vergence system.
Notes: Source: Masters Abstracts International, Volume: 44-02, page: 0771.

Thesis (M.Sc.)--University of Toronto, 2005.

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