Departamento Psicología Experimental, Procesos Cognitivos y Logopedia, Universidad Complutense de Madrid, Pozuelo de Alarcón, Spain.
Vision and Hearing Sciences Research Centre, School of Psychology and Sports Science, Anglia Ruskin University, Cambridge, UK.
Ophthalmic Physiol Opt. 2024 Sep;44(6):1058-1071. doi: 10.1111/opo.13350. Epub 2024 Jun 21.
To evaluate whether colour vision normal (CVN) adults pass two Fletcher-Evans (CAM) lantern tests and to investigate the impact of imposed blur on Ishihara, CAM lantern and computerised colour discrimination test (colour assessment and diagnosis test [CAD] and Cambridge colour test [CCT]) results.
In a pilot experiment, 20 (16 CVN and 4 colour vision deficient [CVD]) participants with normal VA were tested with the CAM lantern. In the main experiment, the impact of imposed dioptric blur (up to +8.00 D) on visual acuity and the Ishihara test, CAM lantern, CAD and CCT was assessed for 15 CVN participants.
CVN participants can fail the CAM lantern, with specificity of 81.25% (aviation mode) and 75% (clinical mode), despite following the test requirements of participants having at least 0.18 logMAR (6/9) in the better eye. With blur, test accuracy was affected. As expected, significant detrimental effects of blur on test results were found for logMAR VA and CAM lantern (aviation) with +1.00 D or higher. Ishihara, CAD and CCT results were not detrimentally affected until +8.00 D. Yellow-blue discrimination was more affected by blur for the CAD than the CCT, which was not explained by the different colour spaces used or vectors tested.
False-positive findings on lantern colour vision tests with small apertures are likely to be increased in patients with blur due to uncorrected refractive error or ocular and visual pathway disease. Other colour vision tests with larger stimuli are more robust to blur.
评估色觉正常（CVN）成年人是否通过两个 Fletcher-Evans（CAM）灯测试，并研究施加的模糊对石原氏、CAM 灯和计算机化颜色辨别测试（颜色评估和诊断测试[CAD]和剑桥颜色测试[CCT]）结果的影响。
在一项初步实验中，20 名（16 名 CVN 和 4 名色觉缺陷[CVD]）视力正常的参与者用 CAM 灯进行了测试。在主要实验中，15 名 CVN 参与者的视力和石原氏测试、CAM 灯、CAD 和 CCT 受到了高达+8.00 D 的屈光度模糊的影响。
CVN 参与者尽管符合参与者至少在较好的眼中具有 0.18 logMAR（6/9）的要求，但仍可能无法通过 CAM 灯，其特异性分别为 81.25%（航空模式）和 75%（临床模式）。随着模糊的出现，测试准确性受到了影响。正如预期的那样，随着模糊度的增加，logMAR VA 和 CAM 灯（航空）的测试结果受到了显著的不利影响，达到+1.00 D 或更高。直到+8.00 D，Ishihara、CAD 和 CCT 的结果才受到不利影响。与 CCT 相比，CAD 中的黄色-蓝色辨别受模糊的影响更大，这不能用使用的不同颜色空间或测试的向量来解释。
由于未矫正的屈光不正或眼部和视觉通路疾病，带有小孔径的灯色觉测试中的假阳性结果在有模糊的患者中可能会增加。具有较大刺激的其他颜色视觉测试对模糊更具鲁棒性。
