Abstract
Purpose :
To compare the accuracies of calculation of intraocular lens (IOL) power using conventional regression formula or American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator with previous corneal refractive surgery.
Methods :
We retrospectively reviewed 96 eyes of 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula using into two means; (1) IOL powers using the ASCRS IOL power calculator, (2) IOL powers using the conventional formula with previous refractive data (Camelin, Jarade, Savini and clinical history method) or without prior data (0, 2 and 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz and Maloney). Two conventional IOL formulas (SRK/T and Hoffer Q) calculated with single K method and double K method. Mean arithmetic refractive error (MARE) and mean absolute error (MAE) was calculated at the first postoperative month.
Results :
In conventional formula, Jarade method or Seitz method, applied in Hoffer Q formula with Single K or Double K method, have the lowest prediction errors. Least prediction error was shown in Shammas-PL method among the ASCRS group. There is no statistically significant difference between the 10 lowest MAE conventional methods and Shammas-PL method using ASCRS calculator.
Conclusions :
Shammas-PL formula, calculated by ASCRS calculator, is considered a comparable method to the 10 most accurate conventional formulae. Other methods using ASCRS show a myopic tendency.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.