AI Article Synopsis
- The study investigates the use of hemifield pattern reversal visual evoked potentials (VEPs) to assess visual field defects caused by lesions behind the optic chiasm.
- It involved 13 patients with various types of brain lesions and 18 normal subjects, focusing on the amplitude differences in VEPs associated with determined visual field defects.
- Findings indicate that greater amplitude asymmetries in VEP responses correlate with homonymous visual field defects, particularly noting that occipital cortex lesions typically result in more significant abnormalities than other types of lesions affecting visual pathways.
Article Abstract
This study was designed to examine the clinical significance and the reliability of hemifield pattern reversal VEPs in the assessment of homonymous visual field defects due to retrochiasmal lesions. 13 patients with traumatic, neoplastic or ischemic lesions of the cerebral parenchyma, and 18 normal subjects were studied. The results show that amplitude asymmetries over 4 microV (between responses evoked by right and left hemifield stimulation, recorded ipsilaterally to the stimulated hemifield) are clinically relevant for hemianopic visual field defect. Significant correlations were found between the VEP features and the site of the damage: lesions of the occipital cortex were generally found to cause more pronounced bioelectrical abnormalities than those due to lesions affecting the visual pathways, with cortical sparing.
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| http://dx.doi.org/10.1007/BF02283022 | DOI Listing |
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