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Table 1: Localization of field defects and disorders of higher cortical visual function
Field Defect or Syndrome Localization
Unilateral central scotoma Optic nerve
Bitemporal hemianopsia Chiasm
Junctional defect (ipsilateral central scotoma and a contralateral superior temporal field cut) Anterior chiasm
Central temporal scotomas Posterior chiasm
Incongruous homonymous hemianopsia, afferent pupillary defect, and bow-tie atrophy Optic tract
Homonymous sectoranopia Lateral geniculate nucleus
Incongruous homonymous hemianopsia Lateral geniculate nucleus
Homonymous upper quadrant defect “pie in the sky” Temporal lobe
Homonymous defect, denser inferiorly Parietal lobe
Gerstmann syndrome and a homonymous defect, denser inferiorly Parietal lobe
Complete homonymous hemianopsia Not well-localized
Homonymous upper quadrantanopsia with macular sparing Occipital lobe (lower bank)
Homonymous lower quadrantanopsia with macular sparing Occipital lobe (upper bank)
Isolated homonymous defect (macular sparing) without other neurologic findings Occipital lobe
Anton syndrome (cortical blindness) Bilateral occipital lobe lesions
Balint syndrome Bilateral occipitoparietal lesions
Alexia without agraphia Left occipital lobe and angular gyrus
Central achromatopsia Bilateral occipito-temporal lesions