Test-retest variability of FrACT using 18 trials: 74 eyes of 37 naive, visually normal subjects, not necessarily wearing best correction, were analyzed. (a) Scatter plot. Along the continuous 45° line, perfect reproducibility would be obtained. The parallel dashed lines indicate a deviation of ±3 lines on retest from the initial test. There was no improvement of repeatability by post-hoc analysis. (b) The best-PEST data, depicted as difference test-retest vs. average of test-retest (Bland-Altman plot [4, 5]); the abscissa covers the same range as (a). The mean test-retest difference is close to zero, and variability does not change markedly across the acuity range covered
Figure 6 illustrates the test-retest reproducibility.
In Fig. 6 b, the Best-Pest results are depicted as a
Bland-Altman [ 4 , 5 ] plot (after taking the logarithm of all
acuities, the difference test-retest vs.
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