Purpose. To assess the simulated keratometry (Sim K) and the total corneal refractive power (TCRP) in eyes undergoing\nconventional corneal cross-linking (CXL). Methods. This study comprised 20 eyes of 20 keratoconic patients (14men and 6 women;\nmedian age (25th and 75th percentile), 26.5 (21.8, 38.0) years) who underwent CXL. The Sim K and TCRP were measured with\na rotating Scheimpflug system (Pentacam HR, Oculus), preoperatively and 1, 3, 6, and 12 months postoperatively. Results. The\nvalues of Sim K were 52.65 (46.00, 55.70), 52.45 (45.85, 56.88), 51.70 (45.78, 55.83), 51.40 (45.68, 56.80), and 51.25 (46.08, 56.15) D\npreoperatively and 1, 3, 6, and 12months postoperatively, respectively.Thecorresponding figures of TCRP were 52.10 (45.48, 55.08),\n51.30 (45.18, 55.20), 50.95 (45.15, 54.50), 50.00 (45.18, 55.08), and 49.80 (45.48, 54.15) D, respectively.The variances of the SimK and\nTCRP data were not statistically significant (p=0.994 and p=0.970, respectively, Kruskalâ??Wallis test). The Sim K was significantly\nlarger than the TCRP before CXL and at 1, 3, 6, and 12months after CXL (p<0.001, Wilcoxon signed-rank test). Conclusions. Not\nonly the SimK but also TCRP was decreased by approximately 1 D after CXL.TheSimK readingsmay overestimate the TCRP, even\nafter CXL for progressive keratoconus.
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