摘要
早期糖尿病视网膜病变治疗研究（early treatment diabetic retinopathy study,ETDRS）视力表是在Bailey-Lovie视力表基础上发展出来专门用于临床试验的视力表,其原理较Snellen视力表科学和合理,精确度和可重复性都高于后者,检查所耗时间较后者长,其logMAR视力结果可直接用于视力统计.ETDRS视力表能通过不同测试距离（4、2、1 m）对极低视力进行量化和评分,并且不同测试距离视力值可相互转化.但1 m以下测量时理论值和实际测量值存在较大误差,为了避免夸大视力改进或丢失的情况,应谨慎对待不同测试距离的转化值.
Early treatment diabetic retinopathy study （ETDRS） charts was designed for vision research, which incorporated features of the original Bailey-Lovie charts. Compared with Snellen chart. The design of ETDRS chart is much more scientific and reasonable, accuracy and repeatability is better, but it takes more time; the logMAR testing results of ETDRS chart can be used directly in statistics, low vision can be quantified and evaluated reliably by the ETDRS chart, by changing the viewing distance to 4, 2, 1 meter, conversion of logMAR values in different testing distance is applicable. Due to discrepancy between theoretical and virtual testing values, it＇s possible to exaggerate visual gain and loss, we should be cautions of converted values of different testing distance.
出处
《中华眼视光学与视觉科学杂志》
CAS
2013年第10期633-636,共4页
Chinese Journal Of Optometry Ophthalmology And Visual Science
基金
四川省科技支撑计划（2010sz0087）
