一种定制的便携式对数视力表，具有可调节的图表照明，用作农村人群的大规模筛查设备。
A customised portable LogMAR chart with adjustable chart illumination for use as a mass screening device in the rural population.
作者信息
Gouthaman M, Raman R P, Kadambi A, Padmajakumari R, Paul P G, Sharma T
机构信息
Sankara Nethralaya, 18 College Road, Chennai-600006, Tamil Nadu, India.
出版信息
J Postgrad Med. 2005 Apr-Jun;51(2):112-4, discussion 115.
AIM
To develop a customised, portable, cost-effective (logarithmic minimal angle resolution) LogMAR chart with adjustable illumination for use as a mass vision-screening device in the rural population.
MATERIALS AND METHODS
Visual acuity of 100 individuals was evaluated with a customised chart and compared with the standard Early Treatment Diabetic Retinopathy Study (ETDRS) chart and Snellen's Chart. Bland and Altman analytical techniques were used for analysis.
RESULTS
Test-retest variability of the customised chart was just a one-line difference (95% CI for agreement), and so were the results with the standard ETDRS charts; a variability of 3-line was noted with Snellen's chart. Two-line differences were observed when comparison was made with Standard ETDRS chart and 2 to 3-line differences with Snellen's chart.
CONCLUSION
The customised portable LogMAR chart with adjustable illumination shows less test-retest variability and better agreement with standard ETDRS chart; therefore, it can be used as a mass vision-screening device in rural settings.
目的
开发一种定制的、便携式、经济高效的（对数最小分辨角）LogMAR视力表，其照明可调节，用作农村人群的大规模视力筛查设备。
材料与方法
使用定制视力表对100名个体的视力进行评估，并与标准的糖尿病视网膜病变早期治疗研究（ETDRS）视力表和斯内伦视力表进行比较。采用布兰德和奥特曼分析技术进行分析。
结果
定制视力表的重测变异性仅为一行差异（一致性的95%置信区间），标准ETDRS视力表的结果也是如此；斯内伦视力表的变异性为3行。与标准ETDRS视力表比较时观察到两行差异，与斯内伦视力表比较时观察到2至3行差异。
结论
具有可调节照明的定制便携式LogMAR视力表显示出较小的重测变异性，并且与标准ETDRS视力表的一致性更好；因此，它可作为农村地区的大规模视力筛查设备使用。
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