Retrospective Analysis of Factors Predicting Functional Success in Telescopic Spectacle Use by Low Vision Patients
Retrospective Analysis of Factors Predicting Functional Success in Telescopic Spectacle Use by Low Vision Patients
复制标题
低视力患者使用望远镜眼镜时预测功能成功的因素的回顾性分析
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
I. Ulrich
中科院分区：
文献类型：
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作者：
J. Demer;F. I. Porter;Jefin Goldberg;H. Jenkins;K. Schmidt;I. Ulrich
视障患者经常使用望远镜眼镜，但临床观察表明，低视力患者往往不能达到预期的功能使用这些昂贵的助视器。这可能是由于患者在行走、震颤和姿势不稳定引起的意外头部运动中无法保持视网膜上放大图像的足够稳定性。虽然视觉-前庭-眼反射（VVOR）产生的眼球运动可以部分补偿头部运动，但当头戴式望远镜放大图像时，这种补偿是不完全的有研究表明，在视力正常的受试者中，头部运动显著降低动态视敏度（DVA），即头部运动时的视敏度我们假设头部不稳定的补偿不足可能导致DVA降低和晕动病，从而可能预测低视力患者无法正常使用望远镜眼镜。我们一直在测试这种视网膜图像不稳定假说，以开发可能有助于预测成功使用望远镜眼镜的方法。
Telescopic spectacles are frequently prescribed for visually impaired patients, but clinical observation reveals that low vision patients often do not achieve expected functional use of these costly visual aids. This may be a result of patients’ inability to maintain adequate stability of magnified images on the retina during unintended head movements caused by ambulation, tremor, and postural instability. Although the visual-vestibulo-ocular reflex (VVOR) produces eye movements that partially compensate for head movements, this compensation is incomplete when images are magnified by head-mounted telescopes.1 It has been demonstrated in normally sighted subjects wearing telescopic spectacles that head motion significantly decreases dynamic visual acuity (DVA), the acuity during head motion.2 We hypothesized that insufficient compensation of head instability might cause reduced DVA and motion sickness, and might thus predict failure of low vision patients to make functional use of telescopic spectacles. We have been testing this retinal image instability hypothesis to develop methods that may be useful in prediction of the successful use of telescopic spectacles.