Synkinesis of Accommodation and Vergence in Late‐Onset Myopia
作者:
MARK ROSENFIELD,
BERNARD GILMARTIN,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1987)
卷期:
Volume 64,
issue 12
页码: 929-937
ISSN:0093-7002
年代: 1987
出版商: OVID
关键词: myopia;accommodation;vergence;near-vision;CA/C
数据来源: OVID
摘要:
The accommodative response (AR) to disparity-vergence and blur stimuli was determined for 45 subjects; 15 emmetropes, 15 late-onset myopes (LOM's), and 15 early-onset myopes (EOM's). The accommodative response was measured at approximately 1-s intervals for 50 s using an objective infrared optometer. Disparity-driven accommodation was induced by a 4δ base-out prism at accommodative stimulus levels of 2.50 and 3.25 D. LOM's show significantly higher levels of disparity-induced accommodation when compared with the other two refractive groups. Blur-induced accommodation was produced by increasing the accommodative stimulus from 2.50 to 3.25 D with no concomitant change in vergence stimulus. EOM's exhibit less blur-induced accommodation compared with LOM's and emmetropes. These results are discussed with reference to differences in accommodation-vergence synkinesis between LOM's and EOM's, and in relation to the etiology of late-onset myopia.
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