Document Detail

Variation of topographic visually evoked potentials across the visual field.
MedLine Citation:
PMID:  9135809     Owner:  NLM     Status:  MEDLINE    
We examined the variation of monocular pattern reversal topographic visually evoked potentials across a 13.6 degrees visual field and measured the parameters of the VEP waveforms in 37 locations across the field. Eighteen right and 20 left normal eyes were tested from 23 subjects. The mean response densities of the VEP decreased with increasing eccentricity; response densities are higher in the lower hemifield than in the corresponding mirror symmetric locations in the upper hemifield. The incidence of polarity reversal is higher in the upper hemifield, especially in more superior locations. The latency in the temporal field is shorter than that in the other locations. The coefficients of variations (CVs) of latencies are less than those of amplitudes in corresponding locations and the CVs of latencies of P1 and N2 components are less than those of the N1 component in corresponding locations. The CVs of amplitudes of the waveforms in mid-peripheral locations are larger than those of the other central areas. The parameters of the human topographic visually evoked potential are distributed regularly across the visual field and appear to reflect the underlying anatomy of the retina and visual cortex, and the placement of the recording electrode.
M Z Yu; B Brown
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)     Volume:  17     ISSN:  0275-5408     ISO Abbreviation:  Ophthalmic Physiol Opt     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-06-18     Completed Date:  1997-06-18     Revised Date:  2006-11-07    
Medline Journal Info:
Nlm Unique ID:  8208839     Medline TA:  Ophthalmic Physiol Opt     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  25-31     Citation Subset:  IM    
Department of Optometry and Radiography, Hong Kong Polytechnic University, Hung Hom, Hong Kong.
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MeSH Terms
Analysis of Variance
Evoked Potentials, Visual / physiology*
Pattern Recognition, Visual / physiology
Vision, Monocular / physiology
Visual Fields / physiology*

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