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Reliability of a modified logMAR distant visual acuity chart for routine clinical use

BACKGROUND/AIM: Acuity charts that follow the principle of logarithmic size progression (logMAR charts) are considered to be the gold standard for the assessment of distant vision. But it is not well accepted for routine eye examinations due to increased testing time and the complexity of scoring. T...

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Autores principales: Noushad, Babu, Thomas, Jyothi, Amin, Shristi V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3441035/
https://www.ncbi.nlm.nih.gov/pubmed/22993462
http://dx.doi.org/10.4103/0974-620X.99370
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author Noushad, Babu
Thomas, Jyothi
Amin, Shristi V.
author_facet Noushad, Babu
Thomas, Jyothi
Amin, Shristi V.
author_sort Noushad, Babu
collection PubMed
description BACKGROUND/AIM: Acuity charts that follow the principle of logarithmic size progression (logMAR charts) are considered to be the gold standard for the assessment of distant vision. But it is not well accepted for routine eye examinations due to increased testing time and the complexity of scoring. This study was designed to check whether a modified logMAR chart with three optotypes would provide a reliable acuity assessment compared to standard logMAR charts for routine eye examination. MATERIALS AND METHODS: Two versions of modified and standard logMAR charts were designed, constructed, and used to assess the visual acuity of 50 individuals drawn from a typical out-patient population. Timed test-retest variability and limit of agreement (95% confidence limit of agreement) of the modified chart are compared to the standard logMAR chart using Bland-Altman method. A comparison of the testing time was carried out using paired t-test. RESULTS: The test-retest variability of the charts was comparable, with 95% confidence limit of the mean difference being ±0.08 for standard logMAR and ±0.10 for modified logMAR. Both the versions of modified logMAR charts produced the results which agreed well with those of the standard logMAR charts. The mean testing time required to complete the acuity measurements with the modified chart was significantly lesser compared to the standard chart (P < 0.001). CONCLUSION: The outcomes of the current study demonstrates that the modified logMAR chart with three optotypes offers a comparable result to the standard logMAR charts for assessing distant visual acuity in routine clinical examination set up with a much lesser testing time.
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spelling pubmed-34410352012-09-19 Reliability of a modified logMAR distant visual acuity chart for routine clinical use Noushad, Babu Thomas, Jyothi Amin, Shristi V. Oman J Ophthalmol Original Article BACKGROUND/AIM: Acuity charts that follow the principle of logarithmic size progression (logMAR charts) are considered to be the gold standard for the assessment of distant vision. But it is not well accepted for routine eye examinations due to increased testing time and the complexity of scoring. This study was designed to check whether a modified logMAR chart with three optotypes would provide a reliable acuity assessment compared to standard logMAR charts for routine eye examination. MATERIALS AND METHODS: Two versions of modified and standard logMAR charts were designed, constructed, and used to assess the visual acuity of 50 individuals drawn from a typical out-patient population. Timed test-retest variability and limit of agreement (95% confidence limit of agreement) of the modified chart are compared to the standard logMAR chart using Bland-Altman method. A comparison of the testing time was carried out using paired t-test. RESULTS: The test-retest variability of the charts was comparable, with 95% confidence limit of the mean difference being ±0.08 for standard logMAR and ±0.10 for modified logMAR. Both the versions of modified logMAR charts produced the results which agreed well with those of the standard logMAR charts. The mean testing time required to complete the acuity measurements with the modified chart was significantly lesser compared to the standard chart (P < 0.001). CONCLUSION: The outcomes of the current study demonstrates that the modified logMAR chart with three optotypes offers a comparable result to the standard logMAR charts for assessing distant visual acuity in routine clinical examination set up with a much lesser testing time. Medknow Publications & Media Pvt Ltd 2012 /pmc/articles/PMC3441035/ /pubmed/22993462 http://dx.doi.org/10.4103/0974-620X.99370 Text en Copyright: © 2012 Noushad B et al http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Original Article
Noushad, Babu
Thomas, Jyothi
Amin, Shristi V.
Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title_full Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title_fullStr Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title_full_unstemmed Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title_short Reliability of a modified logMAR distant visual acuity chart for routine clinical use
title_sort reliability of a modified logmar distant visual acuity chart for routine clinical use
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3441035/
https://www.ncbi.nlm.nih.gov/pubmed/22993462
http://dx.doi.org/10.4103/0974-620X.99370
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