Proximal vergence and perceived distance

dc.contributor.advisorBedell, Harold E.
dc.contributor.committeeMemberBreitmeyer, Bruno G.
dc.contributor.committeeMemberFannin, Troy E.
dc.creatorJoubert, Chris
dc.description.abstractThe purpose of this study was to measure the vergence response to a change in physical distance (proximal vergence) and to evaluate its presumed stimulus, change of perceived distance. Vergence posture was measured haploscopically for a large field of blurred horizontal lines, providing minimal disparity and accommodative stimulation, under binocular and monocular viewing at 40, 67 and 200cm. Perceived distances were calculated from the estimated size of projected after images. For 18 normal observers, the change in vergence (in prism diopters per meter angle change in test distance) averaged 2.59 (S.D.[equals]1.44) binocularly and 2.11 (S.D.[equals]1.22) monocularly. Clinical measures were significantly higher, 4.38 (S.D.[equals]1.20) binocularly and 3.42 (S.D.[equals]1.09) monocularly. Haploscopic and clinical measures of proximal vergence correlated only when a modified clinical technique was used. Taking estimated perceived distance into account only partially reduced differences between proximal vergence measured haploscopically and clinically as well as binocularly and monocularly. Both haploscopic and clinical measures of proximal vergence were sizable, indicating this vergence component can contribute substantially to normal vergence responses.
dc.description.departmentOptometry, College of
dc.format.digitalOriginreformatted digital
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.subjectBinocular vision
dc.titleProximal vergence and perceived distance
dc.type.genreThesis of Optometry Optics, Department of Optics of Houston of Science


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