The influence of age on adaptation of disparity vergence and phoria

被引:16
|
作者
Alvarez, Tara L. [1 ]
Kim, Eun H. [1 ]
Yaramothu, Chang [1 ]
Granger-Donetti, Berangere [2 ]
机构
[1] New Jersey Inst Technol, Dept Biomed Engn, Newark, NJ 07102 USA
[2] Essilor Res & Dev, Dept Vis Sci, Paris, France
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
Age; Vergence; Phoria; Adaptation; Eye movements; CONVERGENCE INSUFFICIENCY PATIENTS; DIVERGENCE PEAK VELOCITY; EYE-MOVEMENTS; ACCOMMODATION RESPONSE; FIXATION DISPARITY; BINOCULAR VISION; MOTOR ADAPTATION; HETEROPHORIA; SACCADES; DYNAMICS;
D O I
10.1016/j.visres.2017.01.002
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
A paucity of research exists to investigate whether the normal aging process influences the ability to adapt disparity vergence and phoria. Vergence eye movements and dissociated phoria were recorded from 49 healthy subjects (ages 20-70 years) using an objective eye movement tracking system. Four-degree vergence responses were modified using a double-step protocol. Dynamics of vergence were quantified via peak velocity. The phoria adaptation experiment measured the magnitude (net change in phoria level) and rate (magnitude divided by the time constant) of phoria adaption during 5 min of sustained fixation on a binocular target (40 cm/8.44 degrees from midline). The magnitude of phoria adaptation decreased as a function of age (r= -0.33; p = 0.04). The ability to adapt vergence peak velocity and the rate of phoria adaptation showed no significant age-related influence (p > 0.05). The data suggest that the ability to modify the disparity vergence system and the rate of phoria adaptation are not dependent on age; whereas, the magnitude of phoria adaptation decreases as part of the normal adult aging process. These results have clinical and basic science implications because one should consider age when assessing the changes in the magnitude of phoria adaptation which can be abnormal in those with oculomotor dysfunctions. (C) 2017 Published by Elsevier Ltd.
引用
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页码:1 / 11
页数:11
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