Fig. 4. Lesion of lateral geniculate nucleus (LGN). Slightly incongruent right sectoranopia along the horizontal meridian, with hemorrhage in the vicinity of the LGN. This field defect would result from damage to the midzone of the LGN. (From Rosen ES, Eustace P, Thompson HS, Cumming WJK [eds]: Neuro-Ophthalmology. London: Mosby, 1998.)