title: [Intraocular lens power calculation in cataract phacoemulsification after refractive surgery].
abstract: OBJECTIVE
  To analyze the results of phacoemulsification cataract surgery in eyes that had refractive surgery and to compare the predictability of K value in Holladay II formula of intraocular lens power calculation.
  
  
  METHODS
  Fifteen cases (15 eyes) were divided into 2 groups. Group 1 included 8 eyes, the IOL power was calculated with Holladay II formula and the K value was calculated using surgeon-entered k-value (KS). Group 2 included 7 eyes, the IOL power was calculated with Holladay II formula also, the K value was calculated using k-value from refractive data (KR). The achieved refraction after phacoemulsification was compared with target refraction to assess the predictability of the formula and the accuracy of k-value.
  
  
  RESULTS
  The mean difference between target and achieved refractions after phacoemulsification was (0.90 +/- 0.22) D in group 1 and (0.99 +/- 0.22) D in group 2.
  
  
  CONCLUSIONS
  Holladay II formula is accurate in the IOL power calculation after refractive surgery. There is no significant difference between the results calculated by Holladay II formula with KS or KR.
authors.affiliation: Tianjin Medical University Eye Center, Tianjin 300070, China. hbj151617@yahoo.com.cn
authors.forename: Bo-jie
authors.initials: BJ
authors.lastname: Hu
authors.forename: Shao-zhen
authors.initials: SZ
authors.lastname: Zhao
authors.forename: Peter
authors.initials: P
authors.lastname: Tseng
mesh_terms: D000328:Adult; D000465:Algorithms; D003315:Cornea / Q000502:physiology*; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D054018:Lasers, Excimer; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular / Q000502:physiology*