Fig. 2

Distribution of initial (white) and final (gray) values of the outcome variables a) VAAE, b) IOD-VA and c) stereoacuity and changes in these three variables ((d)-(f)) in the three study groups (anisometropic (A), strabismic (S) and combined-mechanism (C) amblyopes). In panels d) to f), negative values correspond to improved performance following the OTA phase. The number of participants is n = 280 for a), b), d) and e); n = 235 for c) and n = 118 for f). Boxes represent the interquartile interval and whiskers cover the data at largest distance from the median that cannot be considered outliers. The narrowing of the box around the median (“notches”) define the 95% confidence interval of the median. Stereoacuity levels range from 1 (40”) to 7 (> 800”). Initial stereoacuity data for the anisometropic group were unavailable