J Korean Ophthalmol Soc.  2010 Feb;51(2):180-187. 10.3341/jkos.2010.51.2.180.

Comparison of Intraocular Lens Power Calculation Methods for Cataract Surgery after Refractive Surgery: A Retrospective Surgery

• Lee MO
• Chung TY
• Chung ES
• Kee CW

• KMID: 2213138
• DOI: http://doi.org/10.3341/jkos.2010.51.2.180

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.

Keyword

Cataract; Corneal refractive surgery; IOL power calculation

MeSH Terms

Cataract
Eye
Humans
Lenses, Intraocular
Medical Records
Myopia
Refractive Surgical Procedures
Retrospective Studies

Reference

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