<原著>両眼視機能の抑制の電気生理学的研究
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概要
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In order to objectively detect the malfunction of the binocular vision, visually evoked potential (VEP) was examined in normal subjects and patients of amblyopia and strabismus. By a modified synoptophore with TV monitors, both monocular and binocular VEPs to dichoptic stimuli were recorded. The ratio of the VEP amplitude under the binocular condition to that in the monocular condition was defined as 'I-ratio'. When the I-ratio was less than 1.0,it was considered that there was an inhibitory binocular interaction on VEP. All the twelve normal subjects examined showed the I-ratio of less than 1.0,with the mean and the standard deviation of 0.75±0.13. These normal subjects demonstrated retinal rivalry under the binocular condition. As for the amblyopic group, the I-ratio of patients with microtropia and anisometropic amblyopia was significantly smaller than that of the normal control group. In these patients, suppression scotoma was assumed to account for the low I-ratio when the stimulating pattern was exposed to the amblyopic eye. As for the strabismus group, the I-ratio of patients with exotropia varied depending on their ability in simultaneous perception. The patients lacking in simultaneous perception showed very small I-ratio as compared with the patients who had simultaneous perception. Patients with post-operative exotropia showed smaller I-ratio when the stimulating pattern was exposed to the amblyopic eye. As for patients with esotropia, VEP studies revealed no definitive or clear-cut results as a whole, since there underlay many complicated factors for the pathogenesis of esotropia. Patients showing the smaller I-ratio than that of the control group proved to have strong suppression in binocular vision. Therefore, it is concluded from these data that the recording of monocular and binocular VEPs by a modified synoptophore with TV monitors may be useful for the objective assessment of the binocular visual function.
- 近畿大学の論文
- 1989-03-25
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