title: Cataract surgery after refractive surgery.
abstract: OBJECTIVE
  To review recent contributions addressing the challenge of intraocular lens (IOL) calculation in patients undergoing cataract extraction following corneal refractive surgery.
  
  
  RESULTS
  Although several articles have provided excellent summaries of IOL selection in patients wherein prerefractive surgery data are available, numerous authors have recently described approaches to attempt more accurate IOL power calculations for patients who present with no reliable clinical information regarding their refractive history. Additionally, results have been reported using the Scheimpflug camera system to measure corneal power in an attempt to resolve the most important potential source of error for IOL determination in these patients.
  
  
  CONCLUSIONS
  IOL selection in patients undergoing cataract surgery after corneal refractive surgery continues to be a challenging and complex issue despite numerous strategies and formulas described in the literature. Current focus seems to be directed toward approaches that do not require preoperative refractive surgery information. Due to the relative dearth of comparative clinical outcomes data, the optimal solution to this ongoing clinical problem has yet to be determined. Until such data are available, many cataract surgeons compare the results of multiple formulas to assist them in IOL selection for these patients.
authors.affiliation: Department of Ophthalmology, University of California San Francisco, California 94143, USA.
authors.forename: Ayman
authors.initials: A
authors.lastname: Naseri
authors.forename: Stephen D
authors.initials: SD
authors.lastname: McLeod
mesh_terms: D002387:Cataract Extraction; D048988:Corneal Surgery, Laser; D006801:Humans; D019654:Lens Implantation, Intraocular; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications / Q000517:prevention & control; D012029:Refraction, Ocular / Q000502:physiology