Electrode position and the multi-focal visual-evoked potential: Role in objective visual field assessment

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: Th...

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Bibliographic Details
Published in:Australian and New Zealand journal of ophthalmology 1998-05, Vol.26 (S1), p.S91-S94
Main Authors: Klistorner, Alexander I, Graham, Stuart L, Grigg, John R, MB, Francis A Billson
Format: Article
Language:English
Subjects:
Cerebral Cortex - anatomy & histology
cortex
electrode placement
Electrodes
Evoked Potentials, Visual - physiology
Humans
multi-focal visualevoked potential
Ophthalmology - methods
pattern stimulation
visual field
Visual Fields - physiology
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Summary: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.
ISSN:0814-9763
1440-1606
DOI:10.1111/j.1442-9071.1998.tb01386.x