Clinical SciencesIntraocular Lens Power Calculation After Laser In Situ Keratomileusis for Myopia and Hyperopia: A Standardized ApproachFeiz, Vahid M.D.; Mannis, Mark J. M.D., FACS; Garcia-Ferrer, Francisco M.D.; Kandavel, Ganesha M.D.; Darlington, Jason K. M.D.; Kim, Esther M.D.; Caspar, Jeffrey M.D.; Wang, Jane-Ling Ph.D.; Wang, Wei Ph.D.Author Information From the Department of Ophthalmology (V.F.), University of Arkansas for Medical Science; Department of Ophthalmology (M.J.M., F.G.F., G.K., J.K.D., E.K., J.C.), University of California, Davis; Department of Statistics (J.L.W., W.W.), University of California, Davis, U.S.A. Submitted February 7, 2001. Accepted June 26, 2001. This work was funded in part by a generous grant to the Department of Ophthalmology at the University of California, Davis from Research to Prevent Blindness, Inc. Address correspondence and reprint requests to Dr. M. Mannis, Department of Ophthalmology, 4860 Y Street, Suite 2400, Sacramento, CA 95817 Cornea: November 2001 - Volume 20 - Issue 8 - p 792-797 Buy Abstract Purpose. (1) To determine the effect of myopic and hyperopic laser in situ keratomileusis (LASIK) on calculation of intraocular lens (IOL) power. (2) To determine a standard way to approach the IOL power determination after LASIK, and (3) To compare different suggested methods. Methods. Biometric analysis and theoretical calculation of IOL powers for eyes undergoing LASIK for myopia 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 error was directly related to the amount of correction by LASIK. Conclusion. The pre-LASIK refraction can be used theoretically to determine an accurate IOL power. © 2001 Lippincott Williams & Wilkins, Inc.