title: Optimized constants for an ultraviolet light-adjustable intraocular lens.
abstract: OBJECTIVE
  To determine the accuracy of intraocular lens (IOL) power calculations and to suggest adjusted constants for implantation of ultraviolet light-adjustable IOLs.
  
  
  METHODS
  Center for Vision Science, Ruhr University Eye Clinic, Bochum, Germany.
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  Eyes with a visually significant cataract that had phacoemulsification with implantation of a light-adjustable IOL were evaluated. IOLMaster measurements were performed before phacoemulsification and IOL implantation and 4 weeks after surgery before the first adjustment of the IOL. The difference in the expected refraction and estimation error was studied.
  
  
  RESULTS
  The study evaluated 125 eyes. Using the surgical constants provided by the manufacturer of the light-adjustable IOL, the SRK/T formula gave a more hyperopic refraction than the Hoffer Q and Holladay 1 formulas. The mean error of prediction was 0.93 diopter (D) ± 0.69 (SD), 0.91 ± 0.63 D, and 0.86 ± 0.65 D, respectively. The corresponding mean absolute error of prediction was 0.98 ± 0.61 D, 0.93 ± 0.61 D, and 0.90 ± 0.59 D, respectively. With optimized constants for the formulas, the mean error of prediction was 0.00 ± 0.63 D for Hoffer Q, 0.00 ± 0.64 D for Holladay 1, and 0.00 ± 0.66 D for SRK/T.
  
  
  CONCLUSIONS
  The expected refraction after phacoemulsification and implantation of a light-adjustable IOL toward the hyperopic side of the desired refraction could be considered when using the optimized constants for all formulas.
authors: Center for Vision Science, Ruhr University Eye Clinic, Bochum, Bad Hersfeld, Germany.
authors: Ina
authors: I
authors: Conrad-Hengerer
authors: H Burkhard
authors: HB
authors: Dick
authors: Werner W
authors: WW
authors: Hütz
authors: Wolfgang
authors: W
authors: Haigis
authors: Fritz H
authors: FH
authors: Hengerer
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D001699:Biometry; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007368:Interferometry; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D018918:Phacoemulsification; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular / Q000502:physiology; D014466:Ultraviolet Rays