Assessment of visual field impairment by objective technique.
An objective psychophysical technique for investigating visual fields by averaged scalp potentials evoked by pattern gratings of alternating contrast and by sinusoidally modulated flicerking light is applied to a child with a right homonomous hemianopsia. This technique illustrates a value, in obtaining clinical data on visual fields in situations were subjective perimetry is difficult to administer or where conservating diagnostic methods do not yield evidence of pathology.
D002648:Child; D004594:Electrophysiology; D005071:Evoked Potentials; D006423:Hemianopsia / Q000175:diagnosis*; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D013702:Temporal Lobe / Q000502:physiology; D058609:Visual Field Tests; D014794:Visual Fields; D014795:Visual Pathways / Q000502:physiology