A standardized logarithm of the minimum angle of resolution visual acuity chart in Hindi

Ananth Sailoganathan, Ebi Peter Osuobeni, John Siderov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Purpose: The purpose of this study to develop and calibrate a new Hindi logarithm of the minimum angle of resolution (logMAR) visual acuity chart. Methods: A new Hindi visual acuity chart was designed to logMAR specifications using Hindi optotypes experimentally selected to have similar relative legibility under equivalent spherical and cylindrical defocus. The chart calibration study was carried out in a large clinical setup in India. Participants who were literate in English and Hindi participated in the study. Visual acuity was measured with the new Hindi logMAR chart and a modified ETDRS (m-ETDRS) logMAR chart. The method of presentation was randomized between the charts. Repeat visual acuity was measured on a subsequent day with a second version of the Hindi logMAR chart. Results: The Hindi logMAR chart correlated highly with the m-ETDRS logMAR chart (r2 = 0.92); however, the mean visual acuity difference (Hindi logMAR-m-ETDRS logMAR) was nearly one and half lines (0.13 logMAR, 95% confidence interval [CI] = ±0.15 logMAR). The Hindi logMAR chart also proved to be highly repeatable (r2 = 0.99; mean difference 0.005, 95% CI = ±0.04 logMAR). Conclusion: This study reports the first standardized visual acuity chart developed in Hindi incorporating equal letter legibility and logMAR chart design features. The Hindi logMAR visual acuity chart provides a valid and repeatable tool for the measurement of visual acuity in native Hindi language speakers. Future use of the new Hindi chart should incorporate an increase in optotype size of 0.13 logMAR.

Original languageEnglish
Pages (from-to)634-640
Number of pages7
JournalIndian Journal of Ophthalmology
Volume66
Issue number5
Early online date20 Apr 2018
DOIs
Publication statusPublished - 1 May 2018
Externally publishedYes

Fingerprint

Visual Acuity
Confidence Intervals
Calibration
India
Language

Cite this

Sailoganathan, Ananth ; Osuobeni, Ebi Peter ; Siderov, John. / A standardized logarithm of the minimum angle of resolution visual acuity chart in Hindi. In: Indian Journal of Ophthalmology. 2018 ; Vol. 66, No. 5. pp. 634-640.
@article{a5cbd180a05f425f920ef5c94e7d0dba,
title = "A standardized logarithm of the minimum angle of resolution visual acuity chart in Hindi",
abstract = "Purpose: The purpose of this study to develop and calibrate a new Hindi logarithm of the minimum angle of resolution (logMAR) visual acuity chart. Methods: A new Hindi visual acuity chart was designed to logMAR specifications using Hindi optotypes experimentally selected to have similar relative legibility under equivalent spherical and cylindrical defocus. The chart calibration study was carried out in a large clinical setup in India. Participants who were literate in English and Hindi participated in the study. Visual acuity was measured with the new Hindi logMAR chart and a modified ETDRS (m-ETDRS) logMAR chart. The method of presentation was randomized between the charts. Repeat visual acuity was measured on a subsequent day with a second version of the Hindi logMAR chart. Results: The Hindi logMAR chart correlated highly with the m-ETDRS logMAR chart (r2 = 0.92); however, the mean visual acuity difference (Hindi logMAR-m-ETDRS logMAR) was nearly one and half lines (0.13 logMAR, 95{\%} confidence interval [CI] = ±0.15 logMAR). The Hindi logMAR chart also proved to be highly repeatable (r2 = 0.99; mean difference 0.005, 95{\%} CI = ±0.04 logMAR). Conclusion: This study reports the first standardized visual acuity chart developed in Hindi incorporating equal letter legibility and logMAR chart design features. The Hindi logMAR visual acuity chart provides a valid and repeatable tool for the measurement of visual acuity in native Hindi language speakers. Future use of the new Hindi chart should incorporate an increase in optotype size of 0.13 logMAR.",
keywords = "Hindi, logarithm of the minimum angle of resolution, repeatability, visual acuity",
author = "Ananth Sailoganathan and Osuobeni, {Ebi Peter} and John Siderov",
year = "2018",
month = "5",
day = "1",
doi = "10.4103/ijo.IJO_1074_17",
language = "English",
volume = "66",
pages = "634--640",
journal = "Indian Journal of Ophthalmology",
issn = "0301-4738",
publisher = "Medknow Publications and Media Pvt. Ltd",
number = "5",

}

A standardized logarithm of the minimum angle of resolution visual acuity chart in Hindi. / Sailoganathan, Ananth; Osuobeni, Ebi Peter; Siderov, John.

In: Indian Journal of Ophthalmology, Vol. 66, No. 5, 01.05.2018, p. 634-640.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A standardized logarithm of the minimum angle of resolution visual acuity chart in Hindi

AU - Sailoganathan, Ananth

AU - Osuobeni, Ebi Peter

AU - Siderov, John

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Purpose: The purpose of this study to develop and calibrate a new Hindi logarithm of the minimum angle of resolution (logMAR) visual acuity chart. Methods: A new Hindi visual acuity chart was designed to logMAR specifications using Hindi optotypes experimentally selected to have similar relative legibility under equivalent spherical and cylindrical defocus. The chart calibration study was carried out in a large clinical setup in India. Participants who were literate in English and Hindi participated in the study. Visual acuity was measured with the new Hindi logMAR chart and a modified ETDRS (m-ETDRS) logMAR chart. The method of presentation was randomized between the charts. Repeat visual acuity was measured on a subsequent day with a second version of the Hindi logMAR chart. Results: The Hindi logMAR chart correlated highly with the m-ETDRS logMAR chart (r2 = 0.92); however, the mean visual acuity difference (Hindi logMAR-m-ETDRS logMAR) was nearly one and half lines (0.13 logMAR, 95% confidence interval [CI] = ±0.15 logMAR). The Hindi logMAR chart also proved to be highly repeatable (r2 = 0.99; mean difference 0.005, 95% CI = ±0.04 logMAR). Conclusion: This study reports the first standardized visual acuity chart developed in Hindi incorporating equal letter legibility and logMAR chart design features. The Hindi logMAR visual acuity chart provides a valid and repeatable tool for the measurement of visual acuity in native Hindi language speakers. Future use of the new Hindi chart should incorporate an increase in optotype size of 0.13 logMAR.

AB - Purpose: The purpose of this study to develop and calibrate a new Hindi logarithm of the minimum angle of resolution (logMAR) visual acuity chart. Methods: A new Hindi visual acuity chart was designed to logMAR specifications using Hindi optotypes experimentally selected to have similar relative legibility under equivalent spherical and cylindrical defocus. The chart calibration study was carried out in a large clinical setup in India. Participants who were literate in English and Hindi participated in the study. Visual acuity was measured with the new Hindi logMAR chart and a modified ETDRS (m-ETDRS) logMAR chart. The method of presentation was randomized between the charts. Repeat visual acuity was measured on a subsequent day with a second version of the Hindi logMAR chart. Results: The Hindi logMAR chart correlated highly with the m-ETDRS logMAR chart (r2 = 0.92); however, the mean visual acuity difference (Hindi logMAR-m-ETDRS logMAR) was nearly one and half lines (0.13 logMAR, 95% confidence interval [CI] = ±0.15 logMAR). The Hindi logMAR chart also proved to be highly repeatable (r2 = 0.99; mean difference 0.005, 95% CI = ±0.04 logMAR). Conclusion: This study reports the first standardized visual acuity chart developed in Hindi incorporating equal letter legibility and logMAR chart design features. The Hindi logMAR visual acuity chart provides a valid and repeatable tool for the measurement of visual acuity in native Hindi language speakers. Future use of the new Hindi chart should incorporate an increase in optotype size of 0.13 logMAR.

KW - Hindi

KW - logarithm of the minimum angle of resolution

KW - repeatability

KW - visual acuity

UR - http://www.scopus.com/inward/record.url?scp=85046017479&partnerID=8YFLogxK

U2 - 10.4103/ijo.IJO_1074_17

DO - 10.4103/ijo.IJO_1074_17

M3 - Article

VL - 66

SP - 634

EP - 640

JO - Indian Journal of Ophthalmology

JF - Indian Journal of Ophthalmology

SN - 0301-4738

IS - 5

ER -