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Changes in human short-wavelength-sensitive and achromatic resolution acuity with retinal eccentricity and meridian

Published online by Cambridge University Press:  05 April 2005

RAYMOND O. BEIRNE ,
MARGARITA B. ZLATKOVA  and
ROGER S. ANDERSON
RAYMOND O. BEIRNE
Affiliation:
Vision Science Research Group, School of Biomedical Sciences, University of Ulster at Coleraine, Coleraine, Northern Ireland, UK
MARGARITA B. ZLATKOVA
Affiliation:
Vision Science Research Group, School of Biomedical Sciences, University of Ulster at Coleraine, Coleraine, Northern Ireland, UK
ROGER S. ANDERSON
Affiliation:
Vision Science Research Group, School of Biomedical Sciences, University of Ulster at Coleraine, Coleraine, Northern Ireland, UK
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Abstract

Psychophysical measurements using achromatic grating resolution acuity in peripheral vision show a prominent retinal asymmetry in acuity which is consistent with predicted values based on available estimates of midget ganglion cell density. Recent studies have shown that peripheral grating resolution acuity values for short-wavelength-sensitive (SWS) isolating gratings in normal observers are closely related to predicted values based on the underlying small bistratified ganglion cell density. By measuring SWS resolution acuity at different locations across the visual field, we wished to see if any significant acuity asymmetry exists for the short-wavelength system. In addition to this, we wanted to compare SWS and achromatic resolution acuity at different retinal locations of equal eccentricity. SWS and achromatic grating resolution acuity was measured in two observers at a number of different retinal meridians of 10- and 25-deg eccentricity from the fovea, and out to 35-deg eccentricity along the horizontal meridian. Achromatic resolution acuity was higher than SWS resolution acuity at all locations. At 10-deg eccentricity there was slight radial asymmetry in SWS and achromatic acuity, both displaying highest acuity along the horizontal meridian. At 25-deg eccentricity, SWS and achromatic acuity showed significant asymmetry with acuity being higher in the nasal retina compared to the temporal retina and with higher acuity in the superior retina compared to the inferior retina. At 35-deg eccentricity, the acuity asymmetry along the horizontal meridian was maintained with acuity for both significantly higher in the nasal retina. The SWS acuity changes with eccentricity and meridian were qualitatively similar to that found for achromatic acuity at the majority of retinal locations. Like achromatic acuity, SWS acuity shows significant asymmetry at different retinal locations of equal eccentricity. This suggests that both the midget and small bistratified ganglion cell population density changes significantly with retinal location and eccentricity. SWS acuity appears to change in parallel with achromatic acuity for the majority of retinal locations measured, although the amount of nasotemporal asymmetry appears to be slightly less for the SWS system at 25- and 35-deg eccentricity.

Keywords

SWS acuityAchromatic acuitySmall bistratified ganglion cell densityVisual streak
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 1 , January 2005 , pp. 79 - 86
Copyright
© 2005 Cambridge University Press

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