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To evaluate the accuracy of intraocular lens (IOL) power calculation formulas in eyes after laser in situ keratomileusis (LASIK) in Japanese eyes.
This study included 10 eyes of 10 patients (mean age, 54.0 years) who underwent cataract surgery after LASIK at Keio University Hospital, Tokyo, Japan. The prediction errors were calculated using the following six formulas: Barrett TK Universal 2, Haigis-TK, Barrett True K, Haigis-L, Anterior-Posterior Method (A-P), and Camellin-Calossi. The total keratometry (TK) measured using the IOLMaster 700 (Carl Zeiss Meditec) was used as a keratometric value for the Barrett TK Universal 2 and Haigis-TK formulas. Conventional keratometry was used for the other formulas. The median values of the arithmetic prediction errors among these six IOL calculation formulas were compared.
The median values of the arithmetic prediction errors (diopters [D]) using the six formulas were 0.75 for the Barrett TK Universal 2, 0.16 for Haigis-TK, 0.34 for Barrett True K, -0.26 for Haigis-L, -0.52 for A-P, and -0.19 for Camellin-Calossi. The percentages of eyes within ±0.50 D of the prediction errors were 30% for Barrett TK Universal 2, 90% for Haigis-TK, 80% for Barrett True K, 70% for Haigis-L, 30% for A-P, and 80% for Camellin-Calossi. The percentages of eyes within ±1.00 D of the prediction errors were 70% for Barrett TK Universal 2, 90% for Haigis-TK, 90% for Barrett True K, 90% for Haigis-L, 90% for A-P, and 90% for Camellin-Calossi.
Among the six IOL calculation formulas used after LASIK, the Haigis-TK had the smallest arithmetic prediction error and the highest percentage of eyes within ±0.50 D of the prediction errors in our study. However, the number of cases in the current study was small, and the findings need to be confirmed in the future in more cases.