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Saving space: Comparing mini - logMAR with standard logMAR visual acuity

PURPOSE: Assessing visual acuity (VA) is the cornerstone of an ophthalmic workup and needs VA charts in a four or six meters space. The objective of this study was to compare the performance of distant VA (DVA) on one meter mini-logMAR (MLM) with a standard six meter logMAR (SLM) chart. METHODS: We...

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Autores principales: Kauser, Farnaz, Amitava, Abadan K, Saxena, Juhi, Raza, S Aisha, Masood, Anam, Alam, Md. Shahid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer - Medknow 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7926132/
https://www.ncbi.nlm.nih.gov/pubmed/33323571
http://dx.doi.org/10.4103/ijo.IJO_2391_19
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author Kauser, Farnaz
Amitava, Abadan K
Saxena, Juhi
Raza, S Aisha
Masood, Anam
Alam, Md. Shahid
author_facet Kauser, Farnaz
Amitava, Abadan K
Saxena, Juhi
Raza, S Aisha
Masood, Anam
Alam, Md. Shahid
author_sort Kauser, Farnaz
collection PubMed
description PURPOSE: Assessing visual acuity (VA) is the cornerstone of an ophthalmic workup and needs VA charts in a four or six meters space. The objective of this study was to compare the performance of distant VA (DVA) on one meter mini-logMAR (MLM) with a standard six meter logMAR (SLM) chart. METHODS: We developed a MLM chart to be used at 1 m with +1.0 D spectacles, by reducing the SLM chart designed for 6 meters, to 1/6(th) its size, using AutoCAD version 2014. On an initial cohort, we obtained DVA on the two charts by optometrist trainees, masked to the outcomes on the different tests. We performed regression and checked agreement between the two measurements. Subsequently, on a new cohort, we validated the performance of the MLM. RESULTS: Of the 56 initial subjects, mean DVA with SLM was 0.44 ± 0.13 and with MLM was 0.45 ± 0.13; mean difference of -0.01 ± 0.02, 95%CI: 0.007 to 0.018; P < 0.0001 on paired t-test. There was a significant correlation: r = 0.99; r(2) = 0.98, P < 0.0001. On an average, DVA with MLM was less than a letter worse than with SLM. The regression formula obtained: SLM DVA = -0.1312 + 1.0014 x (MLM DVA). The validation study revealed no significant difference (P = 0.29) between the predicted standard DVA calculated by the regression formula and the actual standard. CONCLUSION: We suggest that we can deduce distance logMAR VA from a mini-logMAR chart as devised and used by us. This will take less space, be portable and allow congenial interaction with patients.
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spelling pubmed-79261322021-03-05 Saving space: Comparing mini - logMAR with standard logMAR visual acuity Kauser, Farnaz Amitava, Abadan K Saxena, Juhi Raza, S Aisha Masood, Anam Alam, Md. Shahid Indian J Ophthalmol Original Article PURPOSE: Assessing visual acuity (VA) is the cornerstone of an ophthalmic workup and needs VA charts in a four or six meters space. The objective of this study was to compare the performance of distant VA (DVA) on one meter mini-logMAR (MLM) with a standard six meter logMAR (SLM) chart. METHODS: We developed a MLM chart to be used at 1 m with +1.0 D spectacles, by reducing the SLM chart designed for 6 meters, to 1/6(th) its size, using AutoCAD version 2014. On an initial cohort, we obtained DVA on the two charts by optometrist trainees, masked to the outcomes on the different tests. We performed regression and checked agreement between the two measurements. Subsequently, on a new cohort, we validated the performance of the MLM. RESULTS: Of the 56 initial subjects, mean DVA with SLM was 0.44 ± 0.13 and with MLM was 0.45 ± 0.13; mean difference of -0.01 ± 0.02, 95%CI: 0.007 to 0.018; P < 0.0001 on paired t-test. There was a significant correlation: r = 0.99; r(2) = 0.98, P < 0.0001. On an average, DVA with MLM was less than a letter worse than with SLM. The regression formula obtained: SLM DVA = -0.1312 + 1.0014 x (MLM DVA). The validation study revealed no significant difference (P = 0.29) between the predicted standard DVA calculated by the regression formula and the actual standard. CONCLUSION: We suggest that we can deduce distance logMAR VA from a mini-logMAR chart as devised and used by us. This will take less space, be portable and allow congenial interaction with patients. Wolters Kluwer - Medknow 2021-01 2020-12-15 /pmc/articles/PMC7926132/ /pubmed/33323571 http://dx.doi.org/10.4103/ijo.IJO_2391_19 Text en Copyright: © 2020 Indian Journal of Ophthalmology http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
spellingShingle Original Article
Kauser, Farnaz
Amitava, Abadan K
Saxena, Juhi
Raza, S Aisha
Masood, Anam
Alam, Md. Shahid
Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title_full Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title_fullStr Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title_full_unstemmed Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title_short Saving space: Comparing mini - logMAR with standard logMAR visual acuity
title_sort saving space: comparing mini - logmar with standard logmar visual acuity
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7926132/
https://www.ncbi.nlm.nih.gov/pubmed/33323571
http://dx.doi.org/10.4103/ijo.IJO_2391_19
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