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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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2012-01-01
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| Series: | Oman Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.ojoonline.org/article.asp?issn=0974-620X;year=2012;volume=5;issue=2;spage=87;epage=90;aulast=Noushad |
| _version_ | 1819057915635433472 |
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| author | Babu Noushad Jyothi Thomas Shristi V Amin |
| author_facet | Babu Noushad Jyothi Thomas Shristi V Amin |
| author_sort | Babu Noushad |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T13:46:54Z |
| format | Article |
| id | doaj.art-fa188f734e2a4e53afb1e12bb9b47576 |
| institution | Directory Open Access Journal |
| issn | 0974-620X |
| language | English |
| last_indexed | 2024-12-21T13:46:54Z |
| publishDate | 2012-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Oman Journal of Ophthalmology |
| spelling | doaj.art-fa188f734e2a4e53afb1e12bb9b475762022-12-21T19:01:50ZengWolters Kluwer Medknow PublicationsOman Journal of Ophthalmology0974-620X2012-01-0152879010.4103/0974-620X.99370Reliability of a modified logMAR distant visual acuity chart for routine clinical useBabu NoushadJyothi ThomasShristi V AminBackground/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.http://www.ojoonline.org/article.asp?issn=0974-620X;year=2012;volume=5;issue=2;spage=87;epage=90;aulast=NoushadLogMARmodified logMARtest-retest variabilityvisual acuity |
| spellingShingle | Babu Noushad Jyothi Thomas Shristi V Amin Reliability of a modified logMAR distant visual acuity chart for routine clinical use Oman Journal of Ophthalmology LogMAR modified logMAR test-retest variability visual acuity |
| 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 | LogMAR modified logMAR test-retest variability visual acuity |
| url | http://www.ojoonline.org/article.asp?issn=0974-620X;year=2012;volume=5;issue=2;spage=87;epage=90;aulast=Noushad |
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