动态视标与LogMAR视力表测定视敏度的一致性比较

岑穎雯; 胡志城

doi:10.3760/cma.j.cn115989-20200613-00431

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中华实验眼科杂志

• 临床研究 •

ENGLISH ABSTRACT

动态视标与LogMAR视力表测定视敏度的一致性比较

作者及单位信息

出版日期： 2021 -06 -10 ·

DOI： 10.3760/cma.j.cn115989-20200613-00431

Comparison of distance visual acuity measurement between dynamic optotype and LogMAR E charts

Authors Info & Affiliations

Rita WM Sum

School of Optometry, The Hong Kong Polytechnic University, Centre for Eye and Vision Research, Hong Kong 810005, China

George C Woo

School of Optometry, The Hong Kong Polytechnic University, Centre for Eye and Vision Research, Hong Kong 810005, China

Published： 2021 -06 -10 ·

DOI： 10.3760/cma.j.cn115989-20200613-00431

APP内阅读

摘要

目的研究动态视标(Dyop ^®)与LogMAR视力表检测视敏度的一致性。

方法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。

结果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。

结论Dyop ^®视力测定与传统LogMAR视力测定在临床上可以互相替代。

关键词：视敏度;视标;动态视力;一致性

ABSTRACT

ObjectiveTo investigate if the dynamic optotype is comparable with conventional logarithm of the minimum angle of resolution (LogMAR) optotype.

MethodsThis is a cross-sectional study investigating visual acuity measurement with two methods.The study lasted for 6 months from May to November 2017.One hundred and fifty subjects (150 right eyes) with age (58.7±14.3) years were recruited in the Optometry Clinics of the School of Optometry, The Hong Kong Polytechnic University.Habitual distance visual acuity of each eye was measured with a 3-meter LogMAR E chart and a Dyop ^® acuity chart displayed on a monitor placed at 6 meters, respectively.Subjects were asked to comment on the Dyop ^® system regarding the overall speed and ease of understanding the test using a 5-point Likert scale.The agreement between the two charts was assessed.This study was approved by an Ethics Committee of The Hong Kong Polytechnic University (No.HSEARS20170215006) in accordance with the Declaration of Helsinki, and written information consent was obtained from all the subjects prior to any ocular examination.

ResultsThe mean difference between the LogMAR E chart and Dyop ^® system was (0.05±0.07) LogMAR units, and the 95% limits of agreement was -0.09 to 0.19.The intra-class correlation coefficient of the two methods was 0.957.In general, 70% (105/150) of the subjects considered the Dyop ^® system fast and 81% (121/150) easy to understand.

ConclusionsVisual acuity measured by the Dyop ^® system is comparable to the traditional LogMAR E chart.

KEYWORDS： Visual acuity;Optotype;Dynamic acuity test;Consistency

Corresponding author: Rita WM Sum, Email: kh.defudabe.uylopmus.atir

CONFLICTS OF INTEREST:

利益冲突： Conflicts of interest：

All authors declare that there is no conflict of interest

COPYRIGHTS:

No content published by the journals of Chinese Medical Association may be reproduced or abridged without authorization. Please do not use or copy the layout and design of the journals without permission.

All articles published represent the opinions of the authors, and do not reflect the official policy of the Chinese Medical Association or the Editorial Board, unless this is clearly specified.

引用本文

岑穎雯,胡志城. 动态视标与LogMAR视力表测定视敏度的一致性比较[J]. 中华实验眼科杂志,2021,39(06)：534-537.

DOI:10.3760/cma.j.cn115989-20200613-00431

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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 ^{[
1
]}. Early detection and management of vision impairment is necessary to prevent avoidable visual loss，and vision-related and health-related quality of life ^{[
2
,

3
,

4
,

5
]}. 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.

Hytowitz designed a new dynamic optotype called the "Dyop ^®" ，which is a rotating and segmented visual stimulus to measure visual acuity.Visual acuity can be measured by varying the diameter and contrast of the targets.Image diameter is adjusted by angular arc width and calibrated with the viewing distance to measure the acuity threshold.The acuity endpoint is determined by the minimum stimulus area which the Dyop ^® segment motion can be perceived.When the threshold is reached，the respondent should perceive a non-moving target.The Dyop ^® system can be used to measure distant and near visual acuities by varying the working distance and screen size of projection.It can be used in conjunction with either a computer monitor or a smartphone.Dyop ^® may be an alternative to measure visual acuity which is independent of culture，literacy，and language，if the acuity measured is comparable with the conventional methods.Harris et al ^{[
6
,

7
]} performed pilot studies to validate visual acuity measurements with the Dyop ^® system.They found it was comparable to measurement with Sloan letters，though the comparison was between dynamic and static acuity.The purpose of this study was to compare visual acuity measurement with Dyop ^® and the LogMAR E chart and see if Harris's finding is repeatable.

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摘要
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