Effect of Head and Eye Positions on Fixation Disparities, Phorias, and Ductions at Near
作者:
MORRIS McKEE,
DALE YOUNG,
PAUL KOHL,
A. REINKE,
ROBERT YOLTON,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1987)
卷期:
Volume 64,
issue 12
页码: 909-915
ISSN:0093-7002
年代: 1987
出版商: OVID
关键词: head posture;direction of gaze;vision testing;cervical proprioception;oculomotor;sensorimotor;phoria;fixation disparity;duction recovery range;near testing
数据来源: OVID
摘要:
This study evaluated the effects of head and gaze position on near fixation disparity, phoria, and duction findings. A population of 104 non-complaining subjects divided by age into 3 groups participated in the study. The primary head and gaze position along with two others approximating the positions used for reading by nonbifocal and bifocal wearers were used. A statistically significant effect was found for the phoria data from the young group, but the magnitude was clinically insignificant. Changes in head and/or gaze positions did not significantly affect fixation disparities or duction recovery ranges. Phorias and fixation disparities showed statistically significant increases in exo deviation with increasing age regardless of head and/or gaze position. Nine of 23 presbyopic subjects gave erratic findings during fixation disparity testing and this casts doubt upon the clinical usefulness of this procedure with presbyopes.
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