Click the lesions to see associated field defects
Optic nerve
Monocular loss of vision
Optic nerve merging with chiasm
Monocular loss of vision associated with contralateral impairment of temporal field
Optic chiasm
Bitemporal hemianopia
Optic tract
Total homonymous hemianopia (usually noncongruous if incomplete)
Temporal lobe
Upper homonymous hemianopia
Geniculate body
Rare total homonymous hemianopia
Parietal lobe
Lower homonymous quadrantanopia
Occipital lobe
Variety of homonymous hemianopias, ranging from total to small homonymous scotomas, depending on the portion of lobe involved; high degree of congruity