Siderov J, Tiu A L
Neurosciences Research Institute, Aston University, Birmingham, UK.
Acta Ophthalmol Scand. 1999 Dec;77(6):673-6. doi: 10.1034/j.1600-0420.1999.770613.x.
The aim of this study was to determine the variability of visual acuity in a large eye clinic.
A cross-sectional study using 50, consecutively presenting adult patients with visual acuity of at least 6/60 and aged between 18 and 75 years was performed. Measurements of visual acuity obtained under normal clinical conditions were compared to measurements obtained using standard clinical research protocols. The variability of visual acuity was assessed by determining the 95% limits of agreement between test and retest measures.
There were no significant differences between test-retest measurements of visual acuity, either aided or unaided. Pearson r correlation coefficients between test and retest measurements were high for both aided and unaided visual acuity. The 95% limits of agreement revealed repeatability of about +/-1.5 logMAR or 1.5 lines on a standard logMAR chart.
In large eye clinics, in order to be confident that a real change in visual acuity has occurred between measurements, a difference of at least 0.15 logMAR (8 letters on a standard logMAR visual acuity chart) is required.
本研究的目的是确定一家大型眼科诊所中视力的变异性。
进行了一项横断面研究，纳入了50例连续就诊的成年患者，其视力至少为6/60，年龄在18至75岁之间。将正常临床条件下获得的视力测量结果与使用标准临床研究方案获得的测量结果进行比较。通过确定测试和复测测量之间的95%一致性界限来评估视力的变异性。
无论是借助辅助工具还是不借助辅助工具，视力的复测测量之间均无显著差异。对于借助辅助工具和不借助辅助工具的视力，测试和复测测量之间的Pearson r相关系数都很高。95%一致性界限显示，在标准对数最小分辨角（logMAR）图表上，重复性约为±1.5 logMAR或1.5行。
在大型眼科诊所中，为了确信两次测量之间视力发生了真正的变化，至少需要0.15 logMAR（标准logMAR视力图表上的8个字母）的差异。
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