Relative roles of resolution and spatial interference in foveal and peripheral vision

Relative roles of resolution and spatial interference in foveal and peripheral vision The rate of change of visual performance with increasing eccentricity of fixation is known to be task dependent. In order to examine eccentricity‐related changes in visual performance when a combination of two different factors influence thresholds, visual acuity in the presence of flanking elements was investigated across the visual field. Interference zones increased in extent with eccentricity at a much faster rate than did resolution thresholds. E2 values, quantifying the eccentricity‐related magnification required, were 1–2° for resolution and 0.1–0.2° for spatial interference. E2 values for resolution in the presence of flanks depended on the proximity of the flanks and their ‘weighting’ in the task. From the results, the magnitude and extent of spatial interference across the visual field can be described quantitatively. Further, the results serve as an example of how observed variations in peripheral threshold gradients might be achieved as a combination of underlying factors with different E2 values. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ophthalmic and Physiological Optics Wiley

Relative roles of resolution and spatial interference in foveal and peripheral vision

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Publisher
Wiley
Copyright
Copyright © 1996 Wiley Subscription Services
ISSN
0275-5408
eISSN
1475-1313
DOI
10.1046/j.1475-1313.1996.95001247.x
Publisher site
See Article on Publisher Site

Abstract

The rate of change of visual performance with increasing eccentricity of fixation is known to be task dependent. In order to examine eccentricity‐related changes in visual performance when a combination of two different factors influence thresholds, visual acuity in the presence of flanking elements was investigated across the visual field. Interference zones increased in extent with eccentricity at a much faster rate than did resolution thresholds. E2 values, quantifying the eccentricity‐related magnification required, were 1–2° for resolution and 0.1–0.2° for spatial interference. E2 values for resolution in the presence of flanks depended on the proximity of the flanks and their ‘weighting’ in the task. From the results, the magnitude and extent of spatial interference across the visual field can be described quantitatively. Further, the results serve as an example of how observed variations in peripheral threshold gradients might be achieved as a combination of underlying factors with different E2 values.

Journal

Ophthalmic and Physiological OpticsWiley

Published: Jan 1, 1996

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