Figure 5.

Scatterplots showing the discriminative power of the combination of CCT and a parameter extracted from statistical modeling of the light-intensity distribution—scale parameter α (left) and shape parameter β (right)—to distinguish between KC (n = 20) and control eyes (n = 20). KC eyes are represented in various colors depending on KC severity: early (light blue, n = 5), mild (bright blue, n = 7), moderate (dark blue, n = 6), and advanced (gray, n = 2). All parameters were acquired from a single Scheimpflug image. The discriminant solid lines were calculated by SVM and 5-fold cross validation. The confidence intervals represented as dashed lines were calculated according the coefficients of variance of α (2.0%) and β (2.5%).