Figure 14.

Illustration of the flap geometry and ablation profile in the LASIK surgery designed for an intended correction of approximately −5 dioptres. The anterior flap diameter F = 9 mm, transition zone diameter T = 6.16 mm, sculpted surface diameter A = 6 mm and optic zone diameter (for least-squares curvature extraction) O = 5 mm. The CCT is 520 µm, and the maximum ablation depth of 87 µm combines with the 150 µm flap thickness to produce a residual central stromal thickness of d₂ = 283 µm.