Functional Bitemporal Quadrantopia and the Multifocal Visual Evoked Potential

Cases of functional bitemporal hemianopia rarely have been reported. The authors describe the case of a patient with dense bilateral inferotemporal quadrantic field defects on a functional basis that was confirmed by multifocal visual evoked potential. The normality of the multifocal visual evoked potential provides evidence of the functional basis of the field defects.