Devos M, Devos H, Spileers W, Arden G B
Universitaire Ziekenhuizen, Dienst Oogheelkunde, Leuven, Belgium.
Eye (Lond). 1995;9 ( Pt 6):751-6. doi: 10.1038/eye.1995.189.
Peripheral colour contrast thresholds were investigated in glaucoma suspects with no or minor visual field alterations, determining the average colour contrast threshold at 12.5 degrees off axis. The technique was introduced as a rapid screening test for pre-glaucomatous visual loss. Using this 'ring' test, all definite glaucoma patients in the initial study had elevated colour contrast thresholds. In our experience, however, a substantial proportion of early glaucoma patients were found to have normal thresholds. The peripheral colour contrast threshold determined by the ring test is an average threshold in the entire annular zone at 12.5 degrees eccentricity. We therefore modified the test procedure without a major increase in test duration. An arcade subtending 45 degrees at 12.5 degrees eccentricity was used to determine colour contrast thresholds in four quadrants of the visual field separately ('quadrant' test). We present here the first results of this novel procedure, investigating peripheral colour contrast thresholds in glaucomatous patients. The quadrant test is shown to be more sensitive than the ring test in the detection of functional loss.
我们对没有视野改变或仅有轻微视野改变的青光眼疑似患者的周边颜色对比度阈值进行了研究，测定了离轴12.5度处的平均颜色对比度阈值。该技术被作为一种针对青光眼前期视力丧失的快速筛查测试引入。在最初的研究中，使用这种“环形”测试，所有确诊的青光眼患者的颜色对比度阈值均升高。然而，根据我们的经验，发现相当一部分早期青光眼患者的阈值是正常的。通过环形测试确定的周边颜色对比度阈值是在离心率12.5度的整个环形区域的平均阈值。因此，我们在不显著增加测试时间的情况下修改了测试程序。使用在离心率12.5度处张角为45度的弓形区域分别测定视野四个象限的颜色对比度阈值（“象限”测试）。我们在此展示这种新程序的首批结果，即研究青光眼患者的周边颜色对比度阈值。结果表明，象限测试在检测功能丧失方面比环形测试更敏感。
