title: Intraocular lens power calculation in high myopic eyes with previous radial keratotomy.
abstract: OBJECTIVE
  To determine an accurate method of intraocular lens (IOL) power calculation in highly myopic eyes with previous radial keratotomy (RK).
  
  
  METHODS
  Five eyes that had undergone RK with preoperative myopia >-14.0 diopters (D) were studied retrospectively. The keratometric values obtained with the clinical history method, contact lens over-refraction method, conventional keratometry, adjusted keratometry, and Orbscan II were compared to the true keratometric value calculated retrospectively with the SRK/T formula.
  
  
  RESULTS
  The true keratometric value was closest to that from the contact lens over-refraction method in one eye and to the flatter keratometric value between simulated keratometry (Sim K) and the 3-mm diameter central zone mean keratometric value obtained with axial keratometric power map of Orbscan II in four eyes.
  
  
  CONCLUSIONS
  The flatter keratometric value between Sim K and the 3-mm zone mean keratometric value from Orbscan II was closest to the true postoperative RK keratometric value of the central cornea.
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Eui Seok
authors.initials: ES
authors.lastname: Han
authors.forename: Jin Hak
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000328:Adult; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007646:Keratotomy, Radial; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D009216:Myopia / Q000601:surgery*; D055095:Optics and Photonics; D018918:Phacoemulsification; D012189:Retrospective Studies