Electrode position and the multi-focal visual-evoked potential

Role in objective visual field assessment

A. I. Klistorner*, S. L. Graham, J. R. Grigg, F. A. Billson

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Purpose/Methods: To improve the performance of visual-evoked potentials (VEP) in the assessment of the human visual field, the multi-focal cortically scaled pattern VEP was recorded up to 25°of eccentricity in normal subjects. Monopolar and varying bipolar electrode positions were used. Results: The monopolar response was strongly biased towards the lower hemifield. Bipolar leads straddling the inion (2 cm above and below) achieved approximately equal signals from the upper and lower visual field. Division into sectors of similar wave-form augments the analysis compared with summed full-field responses. Conclusion: With this technique, the multi-focal VEP can be used to objectively assess the visual field.

Original languageEnglish
Pages (from-to)S91-S94
Number of pages4
JournalAustralian and New Zealand journal of ophthalmology
Volume26
Issue numberSUPPL. 1
Publication statusPublished - 1998
Externally publishedYes

Keywords

  • Cortex
  • Electrode placement
  • Multi-focal visual-evoked potential
  • Pattern stimulation
  • Visual field

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