| Objective estimation of visual acuity with preferential looking. | |
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MedLine Citation:
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PMID: 20861485 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Purpose. A novel preferential looking (PL) procedure that uses quantitative analysis of visual scanning parameters is presented. Methods. Nine adult subjects were presented with a set of 14 visual stimuli (stimuli included three uniform gray fields and one field with black-and-white square wave gratings) spanning the range of spatial frequencies from 1.5 cyc/deg to 35.1 cyc/deg (1.3 logMAR to -0.07 logMAR). A remote gaze-tracking system was used to monitor the subject's eye movements and the relative fixation time (RFT) on the grating target. Subsequently, a four alternative forced-choice psychophysical test (4AFC) was performed with the same visual stimuli. Results. For visual stimuli for which the gratings' positions in the 4AFC test were identified correctly in 100% of the trials (reliably discriminated), the mean RFT was 72.5% ± 9.0%. For stimuli for which the spatial frequencies were higher than the subject's psychophysically determined visual acuity (VA) threshold (nondiscriminated), the mean RFT was 25.3% ± 8.5%. Using three repeated trials at each spatial frequency and a VA detector based on the conditional probability density functions of the RFT, the average VA was underestimated by 0.06 logMAR (range, 0.00-0.20 logMAR). Conclusions. In adults, automated quantitative analysis of visual scanning patterns can be used to estimate VA objectively and rapidly (210 seconds) with a mean error of 0.06 logMAR. The novel approach may form the basis for PL procedures that are more objective and more accurate than the traditional clinical PL procedures. |
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Authors:
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Veit Sturm; Daniel Cassel; Moshe Eizenman |
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Publication Detail:
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Type: Journal Article Date: 2011-02-03 |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: 52 ISSN: 1552-5783 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 2011 |
Date Detail:
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Created Date: 2011-02-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: United States |
Other Details:
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Languages: eng Pagination: 708-13 Citation Subset: IM |
Affiliation:
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Department of Ophthalmology and Visual Sciences, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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