Modified double-K method for intraocular lens power calculation after excimer laser corneal refractive surgery

Megumi Saiki, Kazuno Negishi, Naoko Kato, Rika Ogino, Hiroyuki Arai, Ikuko Toda, Murat Dogru, Kazuo Tsubota

Research output: Contribution to journalArticle

21 Citations (Scopus)

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. Setting: Keio University Hospital, Tokyo, Japan. Design: Case series. 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. 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. 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. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned.

Original languageEnglish
Pages (from-to)556-562
Number of pages7
JournalJournal of Cataract and Refractive Surgery
Volume39
Issue number4
DOIs
Publication statusPublished - 2013 Apr

Fingerprint

Laser Corneal Surgery
Refractive Surgical Procedures
Excimer Lasers
Intraocular Lenses
Laser In Situ Keratomileusis
Intraocular Lens Implantation
Phacoemulsification
Tokyo
Disclosure

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Surgery

Cite this

Modified double-K method for intraocular lens power calculation after excimer laser corneal refractive surgery. / Saiki, Megumi; Negishi, Kazuno; Kato, Naoko; Ogino, Rika; Arai, Hiroyuki; Toda, Ikuko; Dogru, Murat; Tsubota, Kazuo.

In: Journal of Cataract and Refractive Surgery, Vol. 39, No. 4, 04.2013, p. 556-562.

Research output: Contribution to journalArticle

Saiki, Megumi ; Negishi, Kazuno ; Kato, Naoko ; Ogino, Rika ; Arai, Hiroyuki ; Toda, Ikuko ; Dogru, Murat ; Tsubota, Kazuo. / Modified double-K method for intraocular lens power calculation after excimer laser corneal refractive surgery. In: Journal of Cataract and Refractive Surgery. 2013 ; Vol. 39, No. 4. pp. 556-562.
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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. Setting: Keio University Hospital, Tokyo, Japan. Design: Case series. 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. 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. 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. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned.",
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