Mangelschots E, Beerlandt N, Janssens H, Spileers W
UZ St Rafael, Leuven, Belgium.
Eye (Lond). 1996;10 ( Pt 4):479-84. doi: 10.1038/eye.1996.106.
We evaluated colour contrast thresholds in patients with unilateral functional amblyopia. A computer-controlled colour vision test was used to determine colour contrast thresholds along a blue-yellow tritan axis. Prior to the threshold measurement, a heterochromatic flicker brightness test was performed to ensure isoluminance between the test stimulus and the background for every subject individually. Luminance contrast thresholds were also measured using the same computer-based system. Twenty amblyopic patients were tested. All showed normal tritan colour contrast thresholds both for their amblyopic eye and non-amblyopic fellow eye. Luminance contrast thresholds were elevated in all 6 refractive amblyopic eyes, in 4 of 9 strabismic eyes and in 2 of 5 mixed amblyopic eyes. Colour contrast thresholds are normal in functional amblyopia (with central fixation). Whenever elevated tritan colour contrast thresholds are found in patients with a decreased visual acuity, other causes of visual impairment are to be evaluated.
我们评估了单侧功能性弱视患者的颜色对比阈值。使用计算机控制的色觉测试来确定沿蓝黄三原色轴的颜色对比阈值。在进行阈值测量之前，先进行了异色闪烁亮度测试，以确保每个受试者的测试刺激与背景之间的等亮度。还使用相同的基于计算机的系统测量了亮度对比阈值。对20名弱视患者进行了测试。所有患者的弱视眼和健侧眼的三原色颜色对比阈值均正常。在所有6只屈光性弱视眼中、9只斜视性弱视眼中的4只以及5只混合性弱视眼中的2只，亮度对比阈值升高。功能性弱视（中心注视）患者的颜色对比阈值正常。当视力下降的患者出现三原色颜色对比阈值升高时，应评估其他视力损害原因。
