Comparison of Intraocular Lens Power Calculation Methods for Cataract Surgery after Refractive Surgery: A Retrospective Surgery.
10.3341/jkos.2010.51.2.180
- Author:
Myoung Ok LEE
1
;
Tae Young CHUNG
;
Eui Sang CHUNG
;
Chang Won KEE
Author Information
1. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. ckee@skku.edu
- Publication Type:Original Article
- Keywords:
Cataract;
Corneal refractive surgery;
IOL power calculation
- MeSH:
Cataract;
Eye;
Humans;
Lenses, Intraocular;
Medical Records;
Myopia;
Refractive Surgical Procedures;
Retrospective Studies
- From:Journal of the Korean Ophthalmological Society
2010;51(2):180-187
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To investigate the predictability of and propose guidelines for intraocular lens (IOL) power calculation in post-cataract surgery patients with prior corneal refractive surgery and suggest the guideline. METHODS: Medical records of 18 eyes of 16 patients were retrospectively evaluated for IOL power calculation predictability using three combinations of METHODS: 1) clinical history method, modified Maloney method, and the Feiz-Mannis method; 2) single-K formula versus double-K formula; and 3) Three IOL formulas (SRK/T, Holladay 1, and Hoffer Q). RESULTS: The clinical history method using the single-K formula with the SRK/T and Holliday 1 formula showed the best predictability, with an absolute error of 0.60+/-0.63 D and 0.74+/-0.60 D, respectively. The Feiz-Mannis method showed a tendency of myopic prediction, whereas the modified Maloney method showed a tendency of hyperopic prediction, especially in the patients with myopia more than 7 D prior to the refractive surgery. The double-K formula, when compared to the single-K formula, prevented hyperopic prediction when used with the clinical history method or modified Maloney method. CONCLUSIONS: IOL power calculation using the clinical history method with SRK/T or Holliday 1 formula showed the best predictability in patients after corneal refractive surgery. IOL power calculation using the modified Maloney method, however, because of the hyperopic prediction tendency, should be used cautiously, especially for patients with myopia of 7 D or more prior to the refractive surgery.
