Intraocular lens power calculation after laser in situ keratomileusis for myopia and hyperopia - A standardized approach

(1) To determine the effect of myopic and hyperopic laser in situ keratomil eusis (LASIK) on calculation of intraocular lens (IOL) power. (2) To determ ine a standard way to approach the IOL power determination after LASIK, and (3) To compare different suggested methods. Methods. Biometric analysis an d theoretical calculation of IOL powers for eyes undergoing LASIK for myopi a and hyperopia were performed. Results. Manual keratometry after LASIK for myopia resulted in underestimation of IOL power. Manual keratometry after hyperopic LASIK resulted in overestimation of IOL power. The amount of erro r was directly related to the amount of correction by LASIK. Conclusion. Th e pre-LASIK refraction can be used theoretically to determine an accurate I OL power.