| Effect of uncorrected astigmatism on vision. | |
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MedLine Citation:
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PMID: 21333869 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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PURPOSE: To examine the effect of uncorrected astigmatism in older adults. SETTING: University vision clinic. DESIGN: Investigational simulation. METHODS: Healthy adult presbyopes had astigmatism of 0.00 to -4.00 diopters cylinder (DC) × 90 degrees and -3.00 DC × 90, × 180, and × 45 degrees induced with spectacle lenses, with the mean spherical equivalent compensated to plano, in random order. Visual acuity was assessed binocularly using a computerized test chart at 95%, 50%, and 10% contrast. Near acuity and reading speed were measured using standardized reading texts. Light scatter was quantified with a C-Quant straylight meter and driving reaction times with a computer simulator. Visual clarity of a mobile phone and computer screen was subjectively rated. RESULTS: Distance visual acuity in the 21 volunteers decreased with increasing uncorrected astigmatic power (F = 174.50, P < .001) and at lower contrasts (F = 170.77, P < .001). Near visual acuity and reading speed also decreased with increasing uncorrected astigmatism power (P < .001). Light scatter was not significantly affected by uncorrected astigmatism (P > .05); however, the reliability and variability of measurements decreased with increasing uncorrected astigmatic power (P < .05). Driving simulator performance was unaffected by uncorrected astigmatism (P > .05), although subjective rating of clarity decreased with increasing uncorrected astigmatic power (P < .001). Uncorrected astigmatism at the 45-degree or 180-degree orientation resulted in worse distance and near visual acuity and subjective-rated clarity than at the 90-degree orientation (P < .05). CONCLUSIONS: Uncorrected astigmatism, even as low as 1.00 D, caused significantly decreased vision and if left uncorrected could significantly affect patients' independence, quality of life, and well-being. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned. |
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Authors:
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James S Wolffsohn; Gurpreet Bhogal; Sunil Shah |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of cataract and refractive surgery Volume: 37 ISSN: 1873-4502 ISO Abbreviation: J Cataract Refract Surg Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-02-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8604171 Medline TA: J Cataract Refract Surg Country: United States |
Other Details:
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Languages: eng Pagination: 454-60 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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From Aston University (Wolffsohn, Bhogal, Shah), School of Life and Health Sciences, Ophthalmic Research Group, the Midland Eye Institute (Shah), the Midland Eye Centre (Shah), City Hospital, and the Heart of England NHS Foundation Trust (Shah), Solihull Hospital, Birmingham, United Kingdom. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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