Schmidt-Bacher A, Pritsch M, Kolling G
Department of Ophthalmology, Heidelberg University Hospital, Heidelberg, Germany.
Strabismus. 2007 Jan-Mar;15(1):39-43. doi: 10.1080/09273970601180222.
To evaluate the usability and reliability of three different visual acuity (VA) testing procedures using Landolt C's in 8 positions with a semi-automated computer program in school children.
100 school children (median 7 years, 59 boys and 41 girls) were included; only the better eye was tested. We used the semi-automated computer program CORVIS.VT in a forced choice method. Three different test strategies were employed, each two times: A) DIN, B) Standard-Staircase and C) Best-PEST procedure with sequences A, B, C or A, C, B.
Average testing time was 100 s +/- 45 (DIN), 59 s +/- 36 (Staircase) and 77 s +/- 25 (Best-PEST). The mean VA estimated with DIN was equivalent to that with the Best-PEST procedure. However, the mean VA with Standard-Staircase was one line less. In DIN, 76% of the retest scores were within 0.1 logMAR unit of the initial test score (Staircase: 72%, Best-PEST 73%). The 95% confidence interval of test-retest reliability was calculated to be -0.05 +/- 0.24 logMAR in DIN, +0.02 +/- 0.32 logMAR in Staircase, and 0.00 +/- 0.29 logMAR in Best-PEST.
A high percentage of children aged 6 to 9 years (98%) can be tested with Landolt C's (8 positions). We found a decreasing test-retest reliability starting from DIN via Best-PEST to Staircase in this configuration.
使用半自动化计算机程序，在8个位置采用兰多尔特C视标，评估三种不同视力（VA）测试程序在学龄儿童中的可用性和可靠性。
纳入100名学龄儿童（中位数7岁，59名男孩和41名女孩）；仅测试较好的眼睛。我们采用强迫选择法使用半自动化计算机程序CORVIS.VT。采用三种不同的测试策略，每种策略测试两次：A）德国工业标准（DIN），B）标准阶梯法，C）最佳PEST程序，测试顺序为A、B、C或A、C、B。
平均测试时间为100秒±45（DIN）、59秒±36（阶梯法）和77秒±25（最佳PEST）。DIN法估算的平均视力与最佳PEST程序估算的平均视力相当。然而，标准阶梯法的平均视力低一行。在DIN法中，76%的复测分数与初始测试分数相差在0.1 logMAR单位以内（阶梯法：72%，最佳PEST：73%）。重测信度的95%置信区间在DIN法中计算为-0.05±0.24 logMAR，在阶梯法中为+0.02±0.32 logMAR，在最佳PEST法中为0.00±0.29 logMAR。
98%的6至9岁儿童可以使用兰多尔特C视标（8个位置）进行测试。在此配置下，我们发现从DIN法到最佳PEST法再到阶梯法，重测信度逐渐降低。
