Figure 1.

Bland-Altman type plots of the agreement in M power vector values between the three autorefractor and retinoscopy evaluated in this study. The mean difference (MD) and the 95% limits of agreement (LOA) are indicated by the solid, dashed lines in each panel, respectively. The numerical values of these parameters are also indicated in each panel. Negative values along the abscissa of each panel indicate myopic refraction. Positive and negative values along the ordinate of each panel indicate an overestimation and underestimation bias by a given autorefractor, relative to retinoscopy.