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Related Experiment Videos

Functional bitemporal quadrantopia and the multifocal visual evoked potential.

D L Miele1, J G Odel, M M Behrens

  • 1College of Physicians and Surgeons, Columbia University, New York, New York, USA.

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society
|September 23, 2000
PubMed
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Functional bitemporal hemianopia is rare. This case study confirms functional visual field defects using multifocal visual evoked potential, highlighting its utility in diagnosing non-organic vision loss.

Area of Science:

  • Ophthalmology
  • Neuro-ophthalmology

Background:

  • Functional visual field defects, particularly bitemporal hemianopia, are infrequently documented.
  • Understanding the neurophysiological basis of these conditions is crucial for accurate diagnosis.

Observation:

  • A patient presented with dense bilateral inferotemporal quadrantic visual field defects.
  • These defects were suspected to be functional in nature.

Findings:

  • Multifocal visual evoked potential (mfVEP) testing was performed to assess the visual pathway integrity.
  • The mfVEP results were normal, supporting a functional etiology for the observed field defects.

Implications:

  • Normal mfVEP findings in the presence of visual field loss suggest a non-organic cause.

Related Experiment Videos

  • This case underscores the importance of electrophysiological testing in differentiating functional from organic visual impairment.