title: Comparison of intraocular lens power calculation methods after myopic laser refractive surgery without previous refractive surgery data.
abstract: OBJECTIVE
  To compare the accuracy of intraocular lens (IOL) power calculation methods for post-myopic excimer laser surgery patients without previous refractive surgery data using the Holladay IOL Consultant Program and the American Society of Cataract and Refractive Surgery (ASCRS) IOL Power Calculator.
  
  
  METHODS
  Wang Vision Cataract and LASIK Center, Nashville, Tennessee, USA.
  
  
  METHODS
  Case series.
  
  
  METHODS
  Eight methods were used to calculate IOL power: Holladay 2 partial coherence interferometry (PCI)-K, Holladay 2 FlatK, Wang-Koch-Maloney, Shammas No-History, Haigis-L, ASCRS-Average, ASCRS-Min, and ASCRS-Max. The optimum IOL power corresponding to the target refraction was back-calculated using the stable post-cataract surgery refraction and implanted IOL power. Using the optimum IOL power, the predicted IOL power error and the resultant refractive error with each method were calculated and compared.
  
  
  RESULTS
  The Holladay 2 FlatK method was most accurate for IOL power calculation, followed by the Holladay 2 PCI-K, ASCRS-Min, Wang-Koch-Maloney, ASCRS-Average, Shammas No-History, Haigis-L, and ASCRS-Max. Statistically significant differences were observed between Holladay 2 FlatK and Holladay 2 PCI-K (P<.05), Wang-Koch-Maloney and ASCRS-Average (P<.05), and Haigis-L and ASCRS-Max (P<.01). No statistically significant differences were observed between the Holladay 2 PCI-K, ASCRS-Min, and Wang-Koch-Maloney or between the ASCRS-Average, Shammas No-History, and Haigis-L (both P>.05).
  
  
  CONCLUSIONS
  The Holladay 2 FlatK method provided the most accurate IOL power in eyes without previous myopic laser surgery data. If the Holladay IOL Consultant Program is unavailable, the ASCRS methods can be used; the ASCRS-Min represents the most accurate method.
authors.affiliation: Tianjin Medical University Eye Hospital and College of Optometry, Tianjin, China.
authors.forename: Ruibo
authors.initials: R
authors.lastname: Yang
authors.forename: Annie
authors.initials: A
authors.lastname: Yeh
authors.forename: Michael R
authors.initials: MR
authors.lastname: George
authors.forename: Maria
authors.initials: M
authors.lastname: Rahman
authors.forename: Helen
authors.initials: H
authors.lastname: Boerman
authors.forename: Ming
authors.initials: M
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D001699:Biometry / Q000379:methods*; D003315:Cornea / Q000601:surgery; D006801:Humans; D007368:Interferometry; D020731:Keratomileusis, Laser In Situ; D054018:Lasers, Excimer / Q000627:therapeutic use*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D055095:Optics and Photonics; D018918:Phacoemulsification; D018903:Photorefractive Keratectomy; D011184:Postoperative Period; D012189:Retrospective Studies