Faculty Articles

Title

The effect of eccentricity on the contrast response function of multifocal visual evoked potentials (mfVEPs)

ISBN or ISSN

0042-6989

Volume

49

Issue

14

Publication Date / Copyright Date

7-1-2009

First Page

1711

Last Page

1716

DOI Number

10.1016/j.visres.2009.03.021

Abstract

MfVEPs were recorded with a 22 deg radius, 60-sector pattern reversal dartboard stimulus (VERIS) at 6 contrast levels (10, 25, 35, 50, 75, 95%). Contrast response functions (CRFs) based on response amplitudes were adequately described by a simple hyperbolic function. The effect of reducing contrast on the amplitude was most apparent in the central 1 deg radius, which had a C50 (contrast at 50% of the maximum response) in excess of 50%, compared to values for C50 in more eccentric regions that were 30% or lower. Mean latency increased 6 (± 0.7 SE) ms from the highest to the lowest contrast tested, and did not vary sgnificantly with eccentricity.

Disciplines

Optometry

Keywords

multifocal visual evoked potential, mfVEP, contrast, retinal eccentricity, contrast response function.

Peer Reviewed

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