LEA 印地语图表的构建和验证：一项多中心研究。

Construction and Validation of LEA Hindi Chart: A Multicenter Study.

机构信息

International School of Engineering, Hyderabad, India.

Elite School of Optometry, Sankara Nethralaya, Chennai, India.

出版信息

Optom Vis Sci. 2020 May;97(5):351-359. doi: 10.1097/OPX.0000000000001507.

DOI:10.1097/OPX.0000000000001507

PMID:32413007

Abstract

SIGNIFICANCE

This study explains the construction and validation of a chart in Hindi language, one of the commonly spoken languages in the world. The new visual acuity chart is called LEA Hindi chart. The calligraphy construction method described here can help develop other such acuity charts.

PURPOSE

The purpose of this study was to construct and validate a new logMAR Hindi visual acuity chart (LEA Hindi chart) using principles similar to that of LEA symbols acuity chart.

METHODS

A multicenter (three centers) study was conducted in two phases. The first phase consisted of identifying and constructing the Hindi optotypes using calligraphy techniques. The Hindi optotypes were calibrated against the Landolt C optotypes by measuring the threshold distance for visual acuity. In the second phase, the newly constructed LEA Hindi chart was validated against the Early Treatment Diabetic Retinopathy Study (ETDRS) and Landolt C visual acuity charts. Sixty participants were enrolled for the first phase (centers 1 and 2) and for the second phase of the study (centers 1 and 3). Additional 15 participants were enrolled (center 1) for testing repeatability.

RESULTS

Four Hindi optotypes were identified and used for the construction of the chart (first phase). In the second phase, the LEA Hindi chart was found to be comparable with both the Landolt C, (logMAR acuity difference, 0.03 ± 0.13; P > .18) and ETDRS (logMAR acuity difference, -0.02 ± 0.09; P > .25) charts. All the three charts were also found to be repeatable (95% limits of agreement within 0.24 logMAR).

CONCLUSIONS

The newly constructed LEA Hindi visual acuity chart gave comparable levels of visual acuity as that measured in an ETDRS or Landolt C charts. The repeatability was also similar to the standard charts. The LEA Hindi visual acuity chart can be used for patients comfortable with Hindi language and also in studies requiring multiple measurements of visual acuity, to avoid familiarity to a given chart.

摘要

意义

本研究解释了一种印地语视力表的构建和验证，印地语是世界上使用最广泛的语言之一。新的视力表称为 LEA 印地语图表。这里描述的书法构建方法可以帮助开发其他类似的视力表。

目的

本研究的目的是使用类似于 LEA 符号视力表的原理构建和验证一种新的对数视力表印地语视力表（LEA 印地语图表）。

方法

这项多中心（三个中心）研究分为两个阶段进行。第一阶段包括使用书法技术识别和构建印地语视标。通过测量视力的阈值距离，将印地语视标与 Landolt C 视标进行校准。在第二阶段，新构建的 LEA 印地语图表与早期糖尿病视网膜病变治疗研究（ETDRS）和 Landolt C 视力图表进行验证。第一阶段（中心 1 和 2）和研究的第二阶段（中心 1 和 3）共招募了 60 名参与者。另外招募了 15 名参与者（中心 1）进行重复性测试。

结果

确定了四个印地语视标用于图表的构建（第一阶段）。在第二阶段，发现 LEA 印地语图表与 Landolt C（对数视力差，0.03 ± 0.13；P >.18）和 ETDRS（对数视力差，-0.02 ± 0.09；P >.25）图表相当。三个图表的重复性也相似（95%一致性界限在 0.24 对数视力范围内）。