FIGURE 3.

Difference in programmed vs. achieved refractive result for simulated PRK and LASIK procedures for 4 or 8 Diopters of myopia using mean central (3mm) tangential curvature change as a metric. D = Diopters, 0Flap = PRK, 100Flap = LASIK with a 100 micrometer flap thickness, 160Flap = LASIK with a 160 micrometer flap thickness. Clinical groupings of the patient cohort are represented on the x axis as follows: 0 = normal refractive surgery candidates who eventually underwent LASIK, 1 = atypical topographic patterns not categorized as keratoconus suspects, 2 = suspicious topographic patterns not characterized as manifest keratoconus but disqualified from LASIK, and 3 = manifest keratoconus. Means and 95% confidence intervals are displayed.