Variations in accommodation and convergence responses in a minimally controlled photorefractive setting
Variations in accommodation and convergence responses in a minimally controlled photorefractive setting
复制标题
DOI：
10.1097/00006324-200111000-00009
复制
发表时间：
2001-11-01
影响因子：
1.4
通讯作者：
Riddell, PM
中科院分区：
文献类型：
--
作者：
Horwood, AM;Turner, JE;Riddell, PM
目的：一个远程haploscopic photorefretter，设计用于评估婴儿和临床群体的调节和会聚，被用来确定隐斜视矫正性会聚/调节（AC/A）比率在正常的幼稚成人。这些与传统的临床措施进行了比较。研究方法：二十一天真的主题被用来比较闭塞和未闭塞的棱镜盖测试响应与远程haploscopic photorefretter使用文本和图片的目标。结果：虽然两个目标的亮度普遍较低，但在两项研究中，双眼聚散度都适合目标需求。双眼调节表现出更大的滞后最高的目标，要求不高的目标。遮挡不仅降低了聚散度反应，而且经常引起调节的显著降低，特别是对图片目标的调节。发现正常的平均AC/A值，但个体受试者之间的差异很大。结论：虽然平均调节，聚散度，AC/A值与已发表的数据相媲美，我们认为，在这些条件下使用天真的科目，调节往往是不准确的，特别是在闭塞，没有伴随的聚散度损失，至少在低光水平。与先前的研究相比，在近距离反射中，辨别性会聚可能起的作用较小，而其他线索的作用更大。
Purpose: A remote haploscopic photorefractor, designed for assessment of accommodation and convergence in infants and clinical groups, was used to determine heterophoria accommodative convergence/accommodation (AC/A) ratios in normal naive adults. These were compared with conventional clinical measures. Methods: Twenty-one naive subjects were used to compare occluded and unoccluded prism cover test responses with the remote haploscopic photorefractor using a text and picture target. Results: Although luminance was generally low for both targets, binocular vergences were appropriate for target demand in both studies. Binocular accommodation showed greater lag for the highest target accommodative demand and the less demanding target. Occlusion not only reduced vergence response, but also frequently caused a marked reduction in accommodation, especially to the picture target. Normal mean AC/A values were found, but with wide variations between individual subjects. Conclusions: Although mean accommodation, vergence, and AC/A values were comparable with published data, we suggest that in these conditions using naive subjects, accommodation is frequently inaccurate, especially on occlusion, without concomitant loss of vergence, at least at low light levels. Accommodative convergence may play a less important part in, and other cues contribute more to, the near reflex than has been previously suggested.