Revised nomogram enhances IOL power calculation after previous LASIK
An updated nomogram enabled accurate prediction of refractive error in eyes undergoing cataract surgery after LASIK, according to a study.
The study authors evaluated the Diehl-Miller nomogram in a new group of eyes rather than the eyes that provided input for the original formula.
Investigators used IOL power data and post-LASIK refractive data to calculate target refractive error that would achieve emmetropia and devised a refined equation based on those data.
Calculated target refractive error varied from true target refractive error by an absolute mean of 0.48 D. Calculated target refractive error was within 0.5 D of the true target in 49% of patients and within 1 D in 93%.
Calculated mean target refractive error was –0.94 D. Mean achieved postoperative spherical equivalent error was –0.18 D.