title: Intraocular lens power calculation for eyes with an axial length greater than 26.0 mm: comparison of formulas and methods.
abstract: OBJECTIVE
  To evaluate and compare the accuracy of formulas and methods for calculating the intraocular lens (IOL) power for eyes with an axial length (AL) greater than 26.0 mm.
  
  
  METHODS
  Ein-Tal Eye Center, Tel-Aviv, Israel.
  
  
  METHODS
  Retrospective case series.
  
  
  METHODS
  The postoperative refraction results in myopic eyes with an AL over 26.0 mm were compared with the predicted refractions calculated using standard formulas (Holladay 1, SRK/T, Hoffer Q, and Haigis) with optical IOL constants, User Group for Laser Interference Biometry constants, and an AL-adjustment method and using new-generation formulas (Barrett Universal II, Holladay 2, and Olsen).
  
  
  RESULTS
  In 76 (71.7%) of 106 eyes, the IOL was 6.0 diopters (D) or more (Group A) and in 30 eyes (28.3%) was less than 6.0 D (Group B). In Group A, the SRK/T, Hoffer Q, Haigis, Barrett Universal II, Holladay 2, and Olsen methods met the benchmark criteria of having a prediction error of ±0.5 D in at least 71.0% of eyes and ±1.0 D in 93.0% of eyes. In Group B, only the Barrett Universal II formula and the Holladay 1 and Haigis formulas using the AL-adjusted method met those criteria.
  
  
  CONCLUSIONS
  When selecting IOLs for high and extreme myopia, choosing appropriate formulas and methods can yield accurate refractive results that meet benchmark criteria.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA. Electronic address: adi.abulafia@gmail.com.
authors.forename: Adi
authors.initials: A
authors.lastname: Abulafia
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Graham D
authors.initials: GD
authors.lastname: Barrett
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Rotenberg
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Guy
authors.initials: G
authors.lastname: Kleinmann
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Adi
authors.initials: A
authors.lastname: Levy
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Olga
authors.initials: O
authors.lastname: Reitblat
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Douglas D
authors.initials: DD
authors.lastname: Koch
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: From the Ein-Tal Eye Center (Abulafia, Rotenberg, Kleinmann, Levy, Reitblat, Assia), Tel-Aviv, the Meir Medical Center (Assia), Kfar-Saba, the Tel-Aviv University (Abulafia, Assia), Ramat Aviv, and the Kaplan Medical Center (Rotenberg, Kleinmann), Rehovot, Israel; the Sir Charles Gairdner Hospital (Abulafia, Barrett), Nedlands, Australia; the Cullen Eye Institute (Koch, Wang), Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Ehud I
authors.initials: EI
authors.lastname: Assia
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D058452:Axial Length, Eye / Q000473:pathology*; D001699:Biometry / Q000379:methods*; D002386:Cataract / Q000150:complications; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D047728:Myopia, Degenerative / Q000150:complications / Q000473:pathology / Q000534:rehabilitation; D055095:Optics and Photonics; D018918:Phacoemulsification; D012029:Refraction, Ocular / Q000502:physiology; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology