弱视筛查：儿科字母测试的比较
Screening for amblyopia: a comparison of paediatric letter tests.
作者信息
Simmers A J, Gray L S, Spowart K
机构信息
Department of Vision Sciences, Glasgow Caledonian University.
出版信息
Br J Ophthalmol. 1997 Jun;81(6):465-9. doi: 10.1136/bjo.81.6.465.
AIMS/BACKGROUND: The measurement of visual acuity is the most widely accepted indicator of amblyopia and is thought by some to be the only effective screening test. The aim of this study was to investigate the effectiveness of the traditional single optotype Sheridan-Gardiner test (SGT) in the measurement of visual acuity and the detection of amblyopia, compared with the log based linear format Glasgow acuity cards (GAC).
METHODS
In the present study visual acuity was measured monocularly in 702 primary 1 schoolchildren using both acuity tests.
RESULTS
A significant difference was found in the mean (SD) visual acuity measured with GAC (0.9 (0.08) modified logMAR) and SGT (1.13 (0.09) modified logMAR), df = 632, t = -59.08, p = 0.0001. The majority of children (89.3%) achieved visual acuities better than 6/6 in either eye when using the single optotype test. If the 95% confidence limits for a significant interocular difference in acuity are used as-criteria for the detection of unilateral amblyopia, GAC were found to be the most sensitive, correctly identifying 100%, while SGT identified 55% of the children with unilateral amblyopia.
CONCLUSION
The results of this study highlight several problems with both the test format and testing procedure in the present school screening system.
目的/背景：视力测量是弱视最广泛认可的指标，一些人认为它是唯一有效的筛查测试。本研究的目的是将传统的单视标谢里登 - 加德纳测试（SGT）与基于对数的线性格式格拉斯哥视力卡（GAC）进行比较，以研究其在视力测量和弱视检测中的有效性。
方法
在本研究中，使用两种视力测试对702名小学一年级学生进行单眼视力测量。
结果
发现使用GAC测量的平均（标准差）视力（0.9（0.08）改良对数最小分辨角）与SGT测量的平均（标准差）视力（1.13（0.09）改良对数最小分辨角）存在显著差异，自由度 = 632，t = -59.08，p = 0.0001。在使用单视标测试时，大多数儿童（89.3%）双眼视力均优于6/6。如果将视力显著眼间差异的95%置信限用作检测单侧弱视的标准，则发现GAC最敏感，正确识别率为100%，而SGT仅识别出55%的单侧弱视儿童。
结论
本研究结果突出了当前学校筛查系统中测试格式和测试程序存在的几个问题。
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