结论:对FarnsworthD15测试施加时间限制可能会防止患者损害测试。
目的:本研究旨在研究测试时间对未实践和实践受试者的FarnsworthD15色觉测试的影响,并确定最佳测试时间。
方法:21名受试者(平均/标准差年龄,33.1/9.3岁)的一系列先天性色觉缺陷参与了研究。假等色平板筛选,为了分类的目的,进行了FarnsworthD15和异形镜测试。每次两次访问,在30秒至10分钟的测试时间范围内进行了10次FarnsworthD15试验。在访问之间,受试者练习测试。主要交叉被用作结果测量。重复测量方差分析比较了各试验的分数。事后Dunnett的测试分析了成对数据。
结果:尽管在首次就诊的10项试验中发现主要交叉的平均数量没有显着差异(F(9,180)=1.30,p=0.24),第二次访视有显著差异(F(9,180)=4.77,p<0.001).第二次访问的主要交叉的平均数量范围为1.71至5.1,30秒的试验导致主要交叉的数量最多,最长的试验导致主要交叉的数量最少。分析显示,2分钟的时间限制导致了FarnsworthD15结果,这是根据大多数受试者的测验仪预期的。
结论:在这项研究中,发现测试时间会影响实践受试者的表现,但不会影响未实践受试者的表现。基于这项研究,我们建议执行2分钟的时间限制,以阻止那些试图通过FarnsworthD15通过练习的人。其他措施,比如记录病人的行为,也可以采取。
CONCLUSIONS: Imposing a time limit on the Farnsworth D15 test may prevent patients from compromising the test.
OBJECTIVE: This study aimed to investigate the effect of test time on the Farnsworth D15 color vision test in unpracticed and practiced subjects and determine an optimal test time.
METHODS: Twenty-one subjects (mean/standard deviation age, 33.1/9.3 years) with a range of congenital color vision deficiency participated in the study. Pseudoisochromatic plate screening, Farnsworth D15, and anomaloscope testing were performed for classification purposes. At each of 2 visits, 10 trials of the Farnsworth D15 were performed with a range in test times from 30 seconds to 10 minutes. Between visits, subjects practiced the test. Major crossovers were used as the outcome measure. A repeated-measures analysis of variance compared the scores across trials. Post hoc Dunnett\'s testing analyzed the pairwise data.
RESULTS: Although no significant difference in the mean number of major crossovers was found across the 10 trials for the first visit ( F (9, 180) = 1.30, p=0.24), a significant difference was found for the second visit ( F (9, 180) = 4.77, p<0.001). The range of mean number of major crossovers for the second visit was 1.71 to 5.1, with the 30-second trial resulting in the largest number of major crossovers and the longest trial resulting in the smallest number of major crossovers. Analysis showed that a 2-minute time limit resulted in a Farnsworth D15 outcome that would be expected based on the anomaloscope for a majority of subjects.
CONCLUSIONS: In this study, test time was found to affect performance in practiced subjects but not in unpracticed subjects. Based on this study, we recommend enforcing a time limit of 2 minutes to discourage those who try to pass the Farnsworth D15 through practice. Additional measures, such as recording patient behavior, can also be taken.