Sustained Fixation Induced Changes in Phoria and Convergence Peak Velocity

Eun H Kim, Vincent R Vicci, Sang J Han and Tara L Alvarez

PLOS ONE, 2011, vol. 6, issue 6, 1-11

Abstract: Purpose: This study sought to investigate the influence of phoria adaptation on convergence peak velocity from responses located at different initial vergence positions. Methods: Symmetrical 4° convergence step responses and near dissociated phoria (measured at 40 cm from the subject's midline) were recorded from six subjects with normal binocular vision using an infrared limbus tracking system with a haploscope. Two different sustained fixations (1° and 16° convergent rotation along the subject's midline) were used to study whether phoria had an influence on the peak velocity of convergence responses located at two initial vergence positions (1° or ‘far’ steps and 12° or ‘near’ steps). Results: Phoria was significantly adapted after a sustained fixation task at near (16°) and far (1°) (p

Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0020883

DOI: 10.1371/journal.pone.0020883

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