Fig. 2

Bland-Altman Plot of the difference between the VR-based system and the APCT vs. the mean of the VR-based system and the APCT. Upper and lower dotted lines represent the 95% limits of agreement. The half-width of the 95% limits of agreement between the 2 measurements was 11.32 PD. The solid line represents the mean difference, which was 0.88 PD. VR, virtual reality; APCT, alternative prism cover test; XT, exotropia; ET, esotropia; PD, prism diopter