title: Accuracy of modern intraocular lens power calculation formulas in refractive lens exchange for high myopia and high hyperopia.
abstract: OBJECTIVE
  To determine the accuracy of the Holladay 2, Hoffer Q, SRK/T, and Haigis intraocular lens (IOL) power calculation formulas in high myopic and high hyperopic refractive lens exchange (RLE) with hydrophobic acrylic foldable IOLs.
  
  
  METHODS
  Department of Ophthalmology, Johann Wolfgang Goethe University, Frankfurt am Main, Germany.
  
  
  METHODS
  Preoperatively, axial length (AL) was measured by partial coherence interferometry with the IOLMaster. The RLE was performed by phacoemulsification with posterior chamber IOL implantation in the capsular bag. Optimization of the lens constants for each IOL type was done separately for eyes with a positive lens and eyes with a negative lens. Prediction error (predicted refraction - postoperative refraction) and mean absolute error were back-calculated for the Holladay 2, Hoffer Q, SRK/T, and Haigis formulas.
  
  
  RESULTS
  Sixty-three eyes (44 myopic, AL >or=26.0 mm; 19 hyperopic, AL <or=22.0 mm) were included. In myopic and hyperopic RLE, all 4 formulas had an overall good performance. In myopic RLE, the Haigis formula performed better.
  
  
  CONCLUSIONS
  In myopic and hyperopic RLE, optimization of lens constants improved the accuracy of IOL power calculation.
authors: Department of Ophthalmology, Goethe University, Frankfurt am Main, Germany.
authors: Evdoxia
authors: E
authors: Terzi
authors: Li
authors: L
authors: Wang
authors: Thomas
authors: T
authors: Kohnen
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006956:Hyperopia / Q000601:surgery*; D007368:Interferometry; D019654:Lens Implantation, Intraocular / Q000379:methods*; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D055620:Optical Phenomena; D018918:Phacoemulsification / Q000379:methods*; D012029:Refraction, Ocular / Q000502:physiology; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014792:Visual Acuity / Q000502:physiology