title: Assessment of visual field impairment by objective technique.
abstract: 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.
mesh_terms: 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