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Modified double-K method for intraocular lens power calculation after excimer laser corneal refractive surgery.
- Source :
-
Journal of cataract and refractive surgery [J Cataract Refract Surg] 2013 Apr; Vol. 39 (4), pp. 556-62. Date of Electronic Publication: 2013 Feb 14. - Publication Year :
- 2013
-
Abstract
- Purpose: To propose the new anterior-posterior method (A-P method) that does not require historical data to calculate intraocular lens (IOL) power after laser in situ keratomileusis (LASIK) and to compare the accuracy of the method with other IOL formulas after LASIK.<br />Setting: Keio University Hospital, Tokyo, Japan.<br />Design: Case series.<br />Methods: Eyes having phacoemulsification and IOL implantation after myopic LASIK were analyzed retrospectively. The A-P method is a modification of the double-K method using the SRK/T formula in which the estimated pre-LASIK keratometry (K) power calculated from the post-LASIK posterior sagittal power in the 6.0 mm zone is used for the preoperative K value in the double-K method and the post-LASIK anterior sagittal power is used for the postoperative K value. The accuracy of the A-P method was compared with that of other formulas that do not require preoperative data and with formulas that require preoperative data.<br />Results: The median values of the arithmetic and absolute prediction errors using the A-P method were 0.16 diopter (D) and 0.54 D, respectively. The prediction errors using the A-P method were within ± 0.50 D in 46.4% of eyes and within ± 1.00 D in 75.0%. The percentage of eyes within ± 1.00 D of the prediction errors with the A-P method was highest with the no-history methods.<br />Conclusion: The A-P method may be a good option for calculating IOL power in eyes having cataract surgery after LASIK when preoperative LASIK data are unavailable.<br /> (Copyright © 2013 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.)
- Subjects :
- Adult
Aged
Axial Length, Eye
Corneal Pachymetry
Female
Humans
Lens Implantation, Intraocular
Male
Middle Aged
Reproducibility of Results
Retrospective Studies
Biometry methods
Keratomileusis, Laser In Situ
Lasers, Excimer therapeutic use
Lenses, Intraocular
Myopia surgery
Optics and Photonics
Phacoemulsification methods
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4502
- Volume :
- 39
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Journal of cataract and refractive surgery
- Publication Type :
- Academic Journal
- Accession number :
- 23415780
- Full Text :
- https://doi.org/10.1016/j.jcrs.2012.10.044