Vergence facility: Establishing clinical utility
Vergence facility: Establishing clinical utility
复制标题
DOI：
10.1097/00006324-199810000-00018
复制
发表时间：
1998-10-01
影响因子：
1.4
通讯作者：
Bedell, H
中科院分区：
文献类型：
--
作者：
Gall, R;Wick, B;Bedell, H
目的。融合设备测试试图评估融合融合系统快速、准确地响应随时间变化的融合需求的能力[定义为刺激可以通过交替的基础输入(EL)和基础输出(BO)棱镜融合的每分钟循环数(CPM)]，但由于缺乏系统收集的规范数据，使用融合设施作为临床测试的决定受到阻碍。方法：研究方法。20名有症状的受试者和20名对照受试者，年龄在18岁到35岁之间，无论性别和种族，根据自我报告问卷确定的视力症状水平被汇集在一起。纳入/排除标准包括每只眼矫正到6/6(20/20)Snellen或更高视力和正常闪光，根据Morgan的标准和飞行员数据，在1分钟内使用16种BI/BO翻转棱镜在4.0米和0.4米进行测试。结果。有症状者和无症状者水平收敛反应不同，不是所有大小的BI/BO倒棱镜都产生相同的反应差异，3 Delta BI/12 Delta BO倒棱镜在距离和近距离组之间区分最佳。测试结果的重复性(使用3 Delta B1/12 Delta BO棱镜)在远距离较差，在近距离较好。结论。除了提供有价值的规范性数据外，本研究还表明，收敛系统几乎在任何距离上重置其“零点”，并进一步揭示了动态收敛和发散刺激对调节-收敛系统的影响。从临床的角度来看，这些结果改善了双眼视觉异常的诊断，推荐的近收敛设施测试很容易实施，使用常见的翻转棱镜(3 Delta B1/12 Delta BO)，并且具有易于回忆的临床失败标准(15 cpm，BI和BO的总和)。
Purpose. Vergence facility testing attempts to assess the ability of the fusional vergence system to respond rapidly and accurately to changing vergence demands over time [defined as the number of cycles per minute (cpm) that a stimulus can be fused through, alternating base-in (El) and base-out (BO) prisms], Decisions to use vergence facility as a clinical test are hampered by a lack of systematically gathered normative data. Methods. Twenty symptomatic and 20 control subjects with ages between 18 to 35 years of either sex and any race were pooled, based on vision-symptom level determined by a self-report questionnaire. Inclusion/exclusion criteria included vision correctable to 6/6 (20/20) Snellen acuity or better in each eye and normal phorias, Vergence facility response was tested over a 1-min period, using 16 combinations of BI/BO flip prisms at 4.0 and 0.4 m, based on Morgan's norms and pilot data. Results. Horizontal vergence facility responses were not the same among those with and without symptoms, and not all magnitudes of BI/BO flip prisms produced the same response difference, A single flip prism, 3 Delta BI/12 Delta BO, was found to differentiate optimally between groups at distance and near. Repeatability of test results (with the 3 Delta B1/12 Delta BO prism) was poor at distance and good at near. Conclusions. In addition to providing valuable normative data, this study indicates that the vergence system nearly resets its "zero point" at any distance and sheds further light on the results of dynamic convergence and divergence stimulation on the accommodative-vergence system. From a clinical standpoint, the results improve the diagnosis of binocular vision abnormalities, The recommended near vergence facility test is easily implemented, using a commonly available flip prism (3 Delta B1/12 Delta BO) and having a clinical failure criterion that is easily recalled (15 cpm, sum of the BI and BO magnitudes).