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A new central–peripheral corneal curvature method for intraocular lens power calculation after excimer laser refractive surgery
Author(s) -
Saiki Megumi,
Negishi Kazuno,
Kato Naoko,
Arai Hiroyuki,
Toda Ikuko,
Torii Hidemasa,
Dogru Murat,
Tsubota Kazuo
Publication year - 2013
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/aos.12007
Subject(s) - lasik , keratomileusis , dioptre , intraocular lens , intraocular lens power calculation , ophthalmology , medicine , excimer laser , refractive error , cornea , optics , laser , eye disease , visual acuity , physics
. Purpose: To propose the central–peripheral (C‐P) method, which requires no data history to calculate intraocular lens (IOL) powers for eyes that underwent laser in situ keratomileusis (LASIK), and compare the accuracy of the C‐P method with other IOL formulas for eyes after LASIK. Methods: Sixteen patients with cataract (25 eyes) who underwent myopic LASIK were analysed retrospectively. The C‐P method is a modified double‐K method using the SRK/T formula, in which the estimated pre‐LASIK keratometric power calculated from the post‐LASIK peripheral anterior sagittal power (also called the axial power) is used for the Kpre in the double‐K method using the SRK/T formula, and the post‐LASIK anterior sagittal power is used for the Kpost. We compared the accuracy of the C‐P method with other popular IOL calculation formulas for use in eyes after LASIK. Results: The median values of the arithmetic and absolute prediction errors with the C‐P method were 0.11 diopter (D) (range, −1.67 to 1.97 D) and 0.55 D (range, 0.02–1.97 D), respectively. The prediction error using the C‐P method was within ±0.5 D in 48% of eyes, within −1.0 to +0.5 D in 60% of eyes, and within ±1.0 D in 68% of eyes. The C‐P method resulted in a significantly higher percentage of eyes within ±0.5 D than the BESSt formula, Shammas‐PL formula, true net power method, double‐K method using 43.5 D for Kpre, and Feiz‐Mannis method. Conclusion: The C‐P method may be a good option for calculating IOL powers in eyes undergoing cataract surgery after LASIK when the preoperative LASIK data are unavailable.