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| Research article summary (published 27 Feb 2003): |
Comparison of the time courses of concomitant and nonconcomitant vertical phoria adaptation.
Full Abstract
Vertical phoria adaptation was measured before, during, and after 1 h of training with either a prism or magnifying lens. With the prism (concomitant adaptation) a single vertical disparity was presented at primary position. With the magnifier (nonconcomitant adaptation) two vertical disparities of opposite sign were presented along the vertical meridian. Following adaptation, binocular vision was prevented with an eye patch, and vertical phorias were measured periodically along the primary vertical meridian over the course of 8 h. Despite individual variation, adaptation followed approximately exponential time courses. The average time constants for the decay of concomitant and nonconcomitant adaptation were 31 and 83 min, respectively. There was no consistent relationship between the rates of acquisition and decay nor was there a strong relationship between the gains of the adaptive responses and the rates of decay although there was a general trend for the gains of the nonconcomitant responses to be higher and the rate of decay slower than the concomitant responses. The results support the notion that concomitant and nonconcomitant phoria adaptation involve different mechanisms but not the contention that adaptation to prisms is easier or more robust than adaptation to lenses.
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Author information
Author/s: Graf, Erich W (EW); Maxwell, James S (JS); Schor, Clifton M (CM);
Affiliation: Vision Science Group, Department of Optometry, University of California-Berkeley, 360 Minor Hall, School of Optometry, Berkeley, CA 94720-2020, USA.
Journal and publication information
Publication Type: Journal Article
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2003-Mar; vol 43 (issue 5) : pp 567-76
Dates: Created 2003/02/21; Completed 2003/06/20; Revised 2004/11/17;
PMID: 12595003, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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