A new method to perform the cover test.
A new method to perform the cover test.
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一种执行覆盖测试的新方法。
DOI：
10.1016/s0161-6420(86)33719-9
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发表时间：
1986
期刊：
影响因子：
13.7
通讯作者：
K. Pflibsen
中科院分区：
文献类型：
--
作者：
R. Effert;K. Pflibsen
提出了一种新的方法来进行覆盖/不覆盖测试和交替覆盖测试。受试者的头部放在下巴上，他注视着近距离或远距离的物体，一只眼睛从上方被准直的红外光束照亮。一台高灵敏度的红外电视摄像机从下面观察第一幅和第四幅浦肯野像。检查者遮盖未照明的眼睛，并观看电视监视器，比较遮盖前后两个图像的相对位置。通过改变光束的入射角，可以测量偏差量。为了进行交替遮盖测试，用红外透射滤光片遮盖被照射的眼睛。
A new method is presented to perform the cover/uncover test and the alternate cover test. With the subject's head in a chin rest, he fixates an object at either near or far distance, and one eye is illuminated from above with a collimated infrared beam. A high-sensitivity infrared TV camera observes the first and fourth Purkinje images from below. The examiner covers the nonilluminated eye and, viewing a TV monitor, compares the relative positions of the two images before and after covering. By changing the incident angle of the beam, the amount of deviation can be measured. To perform the alternate cover test, the illuminated eye is covered with an infrared transmitting filter.