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Reliability of a modified logMAR distant visual acuity chart for routine clinical use.
Babu Noushad1, Jyothi Thomas, Shristi V Amin
1Department of Optometry, Manipal College of Allied Health Sciences, Manipal University, Manipal, Karnataka, India.
Oman Journal of Ophthalmology
|September 21, 2012
Summary
A modified logMAR chart with fewer optotypes offers reliable distant visual acuity assessment. This new chart significantly reduces testing time compared to standard logMAR charts in routine eye exams.
Area of Science:
- Ophthalmology
- Optometry
- Clinical Vision Science
Background:
- Logarithmic Minimum Angle of Resolution (logMAR) charts are standard for distant vision assessment.
- Routine eye examinations face challenges with logMAR charts due to time and scoring complexity.
Purpose of the Study:
- To evaluate a modified logMAR chart with three optotypes for reliable visual acuity assessment.
- To compare the modified chart's performance against standard logMAR charts for routine eye examinations.
Main Methods:
- Two versions of modified and standard logMAR charts were used.
- Visual acuity was assessed in 50 out-patients.
- Timed test-retest variability and limit of agreement were analyzed using the Bland-Altman method.
- Paired t-test compared testing times.
Main Results:
- Test-retest variability was comparable between standard (±0.08) and modified (±0.10) logMAR charts.
- Modified logMAR charts showed good agreement with standard charts.
- The modified chart significantly reduced testing time (P < 0.001).
Conclusions:
- The modified logMAR chart provides comparable results to standard charts for distant visual acuity.
- This modified chart is suitable for routine clinical eye examinations.
- The modified chart offers a significant reduction in testing time.
