Intraocular lens power adjustment calculator after myopic LASIK/PRK

Abstract

AbstractPurpose To develop a nomogram application for allowing simple and efficient intraocular (IOL) power calculations at the time of cataract surgery in postmyopic LASIK and PRK eyes. Keratorefractive surgery has become the most extended technique for correcting preexisting refraction defects in the last 10 years. It is anticipated that the incidence of cataract in these patients will increase over time. Technically, cataract surgery in patients with prior refractive corneal surgery has shown to be as successful as in virgin eyes. However, difficulties have been found in applying the standard methods for determining the power of the IOL in eyes that have had refractive corneal surgery. Therefore, we propose a computerized‐nomogram calculator to facilitate IOL power prediction using pre‐operative data if available or only postsurgical biometric measurements.Methods After literature review, the 6 most accurate IOL power calculation formulae for myopic LASIK/PRK patients were selected: Double‐K (SRKT), Feiz‐Mannis, Latkany Flat‐K, Modified Masket, Haigis‐L formulate and Shammas. DrPhyton 3.11.3 in Linux Fedora 14 environment was used as programming language for developing an informatics application nomogram.Results Our application provides an intuitive and straightforward computer program to achieve a simple solution for a difficult problem.Conclusion A computerized IOL calculator is an efficient way to facilitate the selection of IOL power in patients that have had prior refractive surgery.