| Investigating unstable fixation in patients with macular disease. | |
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MedLine Citation:
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PMID: 20926809 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Purpose. To assess the effect on visual acuity of compensating fixation instability by controlling retinal image motion in people with macular disease. Methods. Ten patients with macular disease participated in this study. Crowded and noncrowded visual acuity were measured using an eye tracking system to compensate for fixation instability. Four conditions, corresponding to four levels of retinal image motion, were tested: no compensation (normal motion), partial compensation (reduced motion), total compensation (no motion), and overcompensation (increased motion). Fixation stability and the number of preferred retinal loci were also measured. Results. Modulating retinal image motion had the same effect on crowded and noncrowded visual acuity (P = 0.601). When fixation instability was overcompensated, acuity worsened by 0.1 logMAR units (P < 0.001) compared with baseline (no compensation) and remained equal to baseline for all other conditions. Conclusions. In people with macular disease, retinal image motion caused by fixation instability does not reduce either crowded or noncrowded visual acuity. Acuity declines when fixation instability is overcompensated, showing limited tolerance to increased retinal image motion. The results provide evidence that fixation instability does not improve visual acuity and may be a consequence of poor oculomotor control. |
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Authors:
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Antonio F Macedo; Michael D Crossland; Gary S Rubin |
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Publication Detail:
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Type: Journal Article Date: 2011-03-10 |
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 Mar |
Date Detail:
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Created Date: 2011-03-14 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: 1275-80 Citation Subset: IM |
Affiliation:
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UCL Institute of Ophthalmology, London, United Kingdom; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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