A VEP study of the visual pathway function in compressive lesions of the optic chiasm. Full-field versus half-field stimulation

Electroencephalogr Clin Neurophysiol. 1992 May-Jun;84(3):209-18. doi: 10.1016/0168-5597(92)90002-s.


Changes of the pattern reversal visual evoked potentials (VEPs) to half- and full-field stimulation in 50 patients with compressive lesions of the optic chiasm are presented. Temporal half-field stimulation yielded abnormal responses in 85% of the eyes, showing non-recordable P100 in 50% of eyes, while in 35% the P100 was significantly attenuated or delayed. With nasal half-field the percentage of all detectable abnormalities was lower (36% of the eyes). Full-field stimulation revealed VEP abnormalities in 74% of eyes and therefore proved less sensitive than the half-field stimulation. This study adds new evidence that half-field stimulation can be an important adjunct for assessing the function of the optic chiasm.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Cranial Nerve Diseases / complications
  • Cranial Nerve Diseases / physiopathology*
  • Electroencephalography
  • Evoked Potentials, Visual / physiology*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Nerve Compression Syndromes / complications
  • Nerve Compression Syndromes / physiopathology*
  • Optic Chiasm / physiopathology*
  • Photic Stimulation
  • Reaction Time / physiology
  • Visual Acuity / physiology
  • Visual Fields / physiology