Values of refractive error, corneal curvature, astigmatism and central thickness.

SE = refractive error and converted to spherical equivalent, Km = mean corneal curvature (the mean of corneal curvature in horizontal and vertical axis); CA = corneal astigmatism (the difference between corneal curvature in horizontal and vertical axis); CCT = central corneal thickness, MCT = minimum corneal thickness; CMVR = the ratio between CCT and MCT.