Fig. 2. Linear regression analysis of the relationship between anterior and total corneal cylinder power. The solid line represents a linear regression line (Y = 0.914X + 0.361, R² = 0.824, p < 0.001) for the keratoconus group (filled triangles), and the dashed line represents a linear regression line (Y = 0.894X − 0.011, R² = 0.928, p < 0.001) for the normal controls (open circles). CD = cylinder diopters.