Construction and validation of logMAR visual acuity charts in seven Indian languages

被引:0
|
作者
Negiloni, Kalpa [1 ,2 ]
Mazumdar, Deepmala [1 ,2 ]
Neog, Aditya [2 ]
Das, Biman [2 ]
Medhi, Jnanankar [3 ]
Choudhury, Mitalee [3 ]
George, Ronnie Jacob [2 ]
Ramani, Krishna Kumar [1 ,2 ]
机构
[1] Elite Sch Optometry, Srimathi Sundari Subramanian Dept Visual Psychoph, Unit Med Res Fdn, Madras 600016, Tamil Nadu, India
[2] Sankara Nethralaya, Unit Med Res Fdn, Madras, Tamil Nadu, India
[3] Sri Sankardeva Nethralaya, Gauhati, Assam, India
关键词
Legibility; logMAR charts; standardized visual acuity chart; validation; visual acuity; visual impairment; DESIGN; RELIABILITY;
D O I
10.4103/ijo.IJO_1165_17
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: The evaluation of visual impairment requires the measurement of visual acuity with a validated and standard logMAR visual acuity chart. We aimed to construct and validate new logMAR visual acuity chart in Indian languages (Hindi, Bengali, Telugu, Urdu, Kannada, Malayalam, and Assamese). Methods: The commonly used font in each language was chosen as the reference and designed to fit the 5 x 5 grid (Adobe Photoshop). Ten letters (easiest to difficult) around median legibility score calculated for each language based on the results of legibility experiment and differing by 10% were selected. The chart was constructed based on the standard recommendations. The repeatability of charts was tested and also compared with a standard English Early Treatment Diabetic Retinopathy Study (ETDRS) logMAR chart for validation. Results: A total of 14 rows (1.0 to -0.3 logMAR) with five letters in each line were designed with the range of row legibility between 4.7 and 5.3 for all the language charts. Each chart showed good repeatability, and a maximum difference of four letters was noted. The median difference in visual acuity was 0.16 logMAR for Urdu and Assamese chart compared to ETDRS English chart. Hindi and Malayalam chart had a median difference of 0.12 logMAR. When compared to the English chart a median difference of 0.14 logMAR was noted in Telugu, Kannada, and Bengali chart. Conclusion: The newly developed Indian language visual acuity charts are designed based on the standard recommendations and will help to assess visual impairment in people of these languages across the country.
引用
收藏
页码:641 / 646
页数:6
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