Fig. 2

The left plots show Bland–Altman plots for A1- central corneal thickness (µm) and B1- thinnest corneal thickness (µm), comparing Sirius (Costruzione Strumenti Oftalmici, Florence, Italy) vs. Scansys (MediWorks, Shanghai, China). The mean difference, 95% limits of agreement and regression line are shown by blue solid line, red and pink dash-dotted lines, respectively. The right Scatter plots compare mean values of A2- central corneal thickness (µm) and B2- thinnest corneal thickness (µm) measured with Sirius (Costruzione Strumenti Oftalmici, Florence, Italy) and Scansys (MediWorks, Shanghai, China). The blue dash-dotted lines show the regression lines. K, keratometry; CCT, central corneal thickness; TCT, thinnest corneal thickness