Visually evoked cortical potentials in the evaluation of homonymous and bitemporal visual field defects.
Visually evoked cortical potentials were studied in six patients with a homonymous and six with a bitemporal hemianopia by presenting a pattern-reversal stimulus separately to a temporal or nasal retinal area and by recording the responses from leads over the hemispheres. Homonymous visual field defects are characterized by a reduction of VECPs from the affected hemisphere. The disturbance of VECPs in bitemporal hemianopia is more serious, since the fibres from both retinal halves may be damaged by a chiasm tumour.
D005071:Evoked Potentials; D006423:Hemianopsia / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D010812:Physical Stimulation; D014785:Vision, Ocular; D014793:Visual Cortex / Q000503:physiopathology*; D014794:Visual Fields