Lateral phoria at distance: contributions of accommodation.

摘要: Lateral heterophoria at distance often is cited as an index of tonic vergence, yet recent research has shown that vergence in darkness to more convergent than most measures phoria. Two experiments were conducted investigate the possible role accommodation this discrepancy. Experiment I compared phoria 19 young adults with and same subjects. Dark was found be correlated but significantly Hierarchical regression analysis showed individual related subjects' negative (from dark focus distant target) well vergence. II tested 13 evaluate three simple models influence on Distance predicted best by a model included accommodation, accommodative These findings support hypothesis influenced for fixation target. simpler Invest Ophthalmol Vis Sci 33:27332743,1992 Historically, been used standard clinical measure extraocular muscle balance, lateral generally accepted resting or posture binocular 12 Contemporary however, revealed puzzling 3 Measurements alignment total (dark vergence), where there no visual stimulus typically show those obtained dis