研究动态视标(Dyop®)与LogMAR视力表检测视敏度的一致性。
采用横断面研究方法，纳入2017年5—11月在香港理工大学视光学院视光门诊检查的健康受试者150人150眼，均取右眼进行观察，平均年龄(58.7±14.3)岁。所有受试者均分别接受距离3 m的传统LogMAR E视力表和在距离6 m的监视器上Dyop®视力表的远视力测定，测定后受试者采用5分Likert量表对Dyop®视力测定速度和易度进行评分。对2种视力表视力测定结果的一致性进行评估。
LogMAR E视力与Dyop®视力平均差值为(0.05±0.07)LogMAR，2种方法的95%一致性界限为-0.09～0.19。2种方法测定视力的组内相关系数为0.957。70%(105/150)的受试者认为Dyop®视力测定速度较快，81%(121/150)的受试者认为测定方法容易学习。
Dyop®视力测定与传统LogMAR视力测定在临床上可以互相替代。
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Vision impairment is one of the important public health issues，and 285 million people suffer from vision impairment globally，with a prevalence ranging from 5.2% to 26.5% across countries. Early detection and management of vision impairment is necessary to prevent avoidable visual loss，and vision-related and health-related quality of life. Visual acuity measurement investigates visual function and monitors changes in central vision from time to time.Visual acuity measurement needs to be efficient and easy to understand，especially in the underserved areas where resources are insufficient.There are a number of standard visual acuity charts available using optotypes that include letters，numbers，Tumbling E and Landolt C．Logarithm of the minimum angle of resolution (LogMAR) acuity chart has overcome the limitation of the Snellen chart that the progression in letter size of each line is standardized.It is frequently used in clinical trials and clinical practices where precise documentation of visual acuity is necessary.However，conventional methods of visual acuity measurement are sometimes difficult for individuals who are illiterate.
