VA Research and Development LOGO

Logo for the Journal of Rehab R&D
Volume 41 Number 3a, May/June 2004
Pages 359 — 372


Abstract - Multidimensional visual field maps: Relationships among local psychophysical and local electrophysiological measures
William Seiple, PhD; Karen Holopigian, PhD; Janet P. Szlyk, PhD; Carolyn Wu, MD
Department of Ophthalmology, New York University School of Medicine, New York, NY; Chicago Department of
Veterans Affairs (VA) Health Care System, West Side Division, Chicago, IL; Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL
Abstract — Multidimensional psychophysical and electrophysical maps of the central retina are essential for assessing the functioning of the diseased retina. In this study, grating acuity, contrast sensitivity, duration for letter identification, multifocal electroretinograms, and Humphrey visual field thresholds were measured at equivalent positions throughout the central 20. We found that the rates of sensitivity loss were not equivalent for all psychophysical measures. The rate of loss in the duration required for letter identification as a function of eccentricity was the steepest, followed by acuity and contrast sensitivity. The rate of loss in luminance sensitivity as measured in the Humphrey visual field was the shallowest. The pattern of losses also varied across meridians. Specifically, the rate of loss as a function of eccentricity was highest in the vertical meridian and lowest in the horizontal meridian. These maps and the correlations among measures as a function of retinal position serve as a baseline so that we can examine disease effects throughout the retina. In addition, the development of vision rehabilitation programs focused on eccentric viewing training should consider the differential sensitivities of the peripheral retina.

Key words: acuity, contrast sensitivity, eccentricity, electroretinogram.

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