Comparison of Autorefraction and Photorefraction with and without Cycloplegia Using 1% Tropicamide in Preschool Children

Figure 2

Bland–Altman plots illustrating the differences and means of values obtained with the photorefraction without cycloplegia and autorefraction with cycloplegia ((a) spherical equivalent, (b) spherical power, and (c) cylindrical power). The upper and the lower dashed lines represent 95% limits of agreement (calculated as the mean difference ± 1.96 × standard deviation); the solid line represents the mean difference between the methods (bias).

(a)

(b)

(c)