Comparison of Visual Acuities Measured by Decimal and logMAR Charts in Patients With Age-Related Macular Degeneration

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  • 加齢黄斑変性症の視力評価における小数視力表とＩｏｇＭＡＲ表の比較

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Purpose: The purpose of this study was to investigate the difference between the visual acuities (VAs) measured by the conventional decimal visual acuity (VA) chart and the logMAR (logarithm of the minimum angle of resolution) chart in patients with age-related macular degeneration (AMD).<BR>Subjects and Methods: VAs measured by the decimal and logMAR VA charts were obtained from 60 eyes of 58 patients who were diagnosed as AMD. VA using the decimal chart was converted to the logMAR VA and compared to the obtained logMAR value. The correlations of the VA difference between both methods with patient's age and spheral equivalent were also analyzed statistically using simple regression and correlation analysis.<BR>Results: Twenty-nine eyes of 60 eyes (48.3%) showed worse visual acuity in the measurements using logMAR chart in comparison to that of decimal visual acuity chart. We found no significant relation between the differences of visual acuity obtained by the two methods and age or equivalent value. However, as the decimal visual acuity was relatively good, the visual acuity measured by logMAR chart showed decreased value significantly.<BR>Conclusion: AMD patients with better VA tended to show a greater difference between the VAs obtained by the decimal and logMAR charts. This phenomenon may be resulted from crowding effects and should be carefully considered in clinical examinations.

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