Color dissociation artifacts in double Maddox rod cyclodeviation testing.
Color dissociation artifacts in double Maddox rod cyclodeviation testing.
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DOI：
10.1016/s0161-6420(94)31086-4
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发表时间：
1994-12
期刊：
影响因子：
13.7
通讯作者：
Kurt Simons;Kyle Arnoldi;Mary H. Brown
中科院分区：
文献类型：
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作者：
Kurt Simons;Kyle Arnoldi;Mary H. Brown
背景：双Maddox杆测试，基于一只眼睛前面的红色Maddox杆和另一只眼睛前面的透明Maddox杆，用于测量旋转偏斜，通常用于上级斜肌麻痹患者。双Maddox杆测试和其他扭转测量之间的不一致结果，以及一些上级斜肌麻痹患者正常眼的“反常”旋转偏斜的报告，表明双Maddox杆测试的双色格式可能产生人为的扭转测量。方法：40例上级斜肌麻痹患者使用双Maddox杆试验进行两次测试，第二次测试时将红色和白色Maddox杆在眼睛之间颠倒，结果：采用标准的双Maddox棒测试，40例患者中有33例（83%）将其旋转偏斜定位于通过红色Maddox棒观看的眼睛，而与麻痹的偏侧性或注视偏好无关。在所有33名患者中，当在双眼之间互换红色和白色Maddox杆重复测试时，双眼之间感知扭转的偏侧性发生变化。在双眼前使用相同颜色的Maddox棒，18例患者中有17例（94%）局限于患眼外旋。结果表明，在平光子午线上，透明和红色Maddox杆的亮度透射比为7.6：1，光栅空间频率带通比为1.6：1，这可能是造成双Maddox杆测试伪影的原因。提出了一种替代版本的测试，基于双眼前相同颜色的Maddox杆。Maddox杆的平子午线的相对高的空间频率带通特性（通过透明Maddox杆高达20/25 Snellen等效分辨率）也表明双Maddox杆测试应在暗室中进行以避免来自视觉环境线索的偏差。
Background:The double Maddox rod test, based on a red Maddox rod in front of one eye and a clear Maddox rod in front of the other, is used to measure cyclodeviation, typically in patients with superior oblique muscle pareses. Discrepant results between the double Maddox rod test and other torsion measures, and reports of “paradoxic” cyclodeviation in the normal eye of some patients with superior oblique paresis, suggest the two-color format of the double Maddox rod test may produce artifactual torsion measures.Methods:Forty patients with superior oblique paresis were tested twice using the double Maddox rod test, reversing the red and white Maddox rods between eyes for the second test, and 18 were tested further with same-color red or clear Maddox rods in front of both eyes.Results:With the standard double Maddox rod test, 33 (83%) of 40 patients localized their cyclodeviation to the eye viewing through the red Maddox rod, irrespective of laterality of the paresis or fixation preference. In all 33 patients, laterality of the perceived torsion changed between eyes when testing was repeated with red and white Maddox rods interchanged between eyes. With same-color Maddox rods before both eyes, 17 (94%) of 18 patients localized extorsion to the paretic eye. There was a 7.6:1 ratio of luminance transmission and a 1.6:1 ratio of grating spatial frequency bandpass in the plano meridian between the clear and red Maddox rods, which appear to be responsible for the double Maddox rod test artifact.Conclusion:The traditional double Maddox rod test may produce artifactual cyclodeviation measurements. An alternative version of the test, based on same-color Maddox rods in front of both eyes, is proposed. The relatively high spatial frequency bandpass characteristics of the plano meridian of the Maddox rod (as high as 20/25 Snellen equivalent resolution through the clear Maddox rod) also suggests double Maddox rod testing should be conducted in a dark room to avoid biases from visual environment cues.