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 flickering 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 where subjective perimetry is difficult to administer or where conservative diagnostic methods do not yield evidence of pathology.