| Effect of blur adaptation on human parafoveal vision. | |
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MedLine Citation:
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PMID: 22323485 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Purpose:This study investigates whether neural compensation for induced defocus can alter visual resolution in other areas of the human retina beyond the fovea. In certain circumstances, the blur adaptation response may be influenced by refractive status.Methods:The effect of blur adaptation on the central 10 degrees of the retina was investigated in twenty normally-sighted observers (10 emmetropes and 10 myopes, median age 21 years). Visual acuity (VA) was measured at the fovea and at 5 locations of the parafoveal nasal visual field (2°, 4°, 6°, 8°, 10°) with best corrected distance vision. 1 D of myopic defocus was introduced and the same measurements repeated immediately before and after 30 minutes' adaptation.Results:VA declined with increasing eccentricity in the clear, blurred and blur-adapted viewing conditions. The rate of decline was quantified by the parameter E(2), which represents the amount of eccentricity dependence of the acuity task. Foveal and parafoveal VA decreased with the introduction of optical defocus and improved significantly following a period of blur adaptation. The consistent value of E(2) in each condition indicated that these changes in VA were not eccentricity-dependent. Changes in VA under blurred and blur-adapted conditions were of similar magnitudes in myopic and emmetropic observers.Conclusions:Neural adaptation to blur improves VA under defocused conditions in the parafovea as well as the fovea, indicating that the underlying compensatory mechanism acts across a range of spatial scales and independently of retinal eccentricity. Foveal and parafoveal blur adaptation does not vary with refractive error. |
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Authors:
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Aleksandra Mankowska; Kiren Aziz; Matthew P Cufflin; David Whitaker; Edward A H Mallen |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-9 |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: - ISSN: 1552-5783 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Bradford School of Optometry and Vision Science, University of Bradford, Bradford, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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