The representation of the horizontal meridian in the primary visual cortex

J Neuroophthalmol. 2000 Jun;20(2):89-91. doi: 10.1097/00041327-200020020-00004.


The authors report the findings of two patients that confirm the location of the horizontal meridian in the human visual cortex. The first patient had an inferior quadrant defect with a band of horizontal meridian sparing. Magnetic resonance imaging showed a lesion concentrated along the medial striate cortex. The second patient had a homonymous horizontal defect that resulted from removal of an arteriovenous malformation located in the lateral striate cortex. The findings of these two patients demonstrate that the horizontal meridian is represented at the calcarine fissure base in the primary visual cortex.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Anticoagulants / therapeutic use
  • Arteriovenous Malformations / complications*
  • Arteriovenous Malformations / diagnosis
  • Arteriovenous Malformations / surgery
  • Brain Diseases / complications*
  • Brain Diseases / diagnosis
  • Brain Diseases / drug therapy
  • Cerebral Angiography
  • Cerebral Arteries / abnormalities*
  • Cerebral Arteries / diagnostic imaging
  • Cerebral Veins / abnormalities*
  • Cerebral Veins / diagnostic imaging
  • Female
  • Hemianopsia / diagnosis
  • Hemianopsia / etiology*
  • Hemianopsia / therapy
  • Humans
  • Magnetic Resonance Imaging
  • Middle Aged
  • Visual Cortex / pathology*
  • Visual Fields
  • Warfarin / therapeutic use


  • Anticoagulants
  • Warfarin