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. 2018 Jan 18;136(3):286–290. doi: 10.1001/jamaophthalmol.2017.6290

Figure. Difference in Letter Score Acuity Comparing Number vs Alphabet Charts and Landolt C vs Alphabet Charts.

Figure.

A, Bland-Altman plot showing the mean letter score difference between the number and alphabet charts. B, Bland-Altman plot showing the mean letter score difference between the Landolt C and alphabet charts. The mean difference between the number and alphabet charts is smaller than the mean difference between the Landolt C and alphabet charts. The middle horizontal dashed line represents the mean letter score difference, while the dashed lines at the top and the bottom represent the 95% CI.