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Influence of adaptive-optics ocular aberration correction on visual acuity at different luminances and contrast polarities

AuthorsMarcos, Susana ; Sawides, L. ; Gambra, Enrique ; Dorronsoro, Carlos
KeywordsAdaptive optics (AO)
Ocular aberrations
Visual acuity
Contrast polarity
Issue Date6-Oct-2008
PublisherAssociation for Research in Vision and Ophthalmology
CitationJournal of Vision 8(13): 1-12 (2008)
AbstractWe evaluated the visual benefit of correcting astigmatism and high-order aberrations with adaptive optics (AO) on visual acuity (VA) measured at 7 different luminances (ranging from 0.8 to 50 cd/m2) and two contrast polarities (black letters on white background, BoW, and white letters on black background, WoB) on 7 subjects. For the BoW condition, VA increased with background luminance in both natural and AO-corrected conditions, and there was a benefit of AO correction at all luminances (by a factor of 1.29 on average across luminances). For WoB VA increased with foreground luminance but decreased for the highest luminances. In this reversed polarity condition AO correction increased VA by a factor of 1.13 on average and did not produce a visual benefit at high luminances. The improvement of VA (averaged across conditions) was significantly correlated (p = 0.04) with the amount of corrected aberrations (in terms of Strehl ratio). The improved performance with WoB targets with respect to BoW targets is decreased when correcting aberrations, suggesting a role of ocular aberrations in the differences in visual performance between contrast polarities.
Description12 pages, 10 figures.
Publisher version (URL)http://journalofvision.org/8/13/1/
Appears in Collections:(CFMAC-IO) Artículos
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