title: Prospective multicenter study of toric IOL outcomes when dual zone automated keratometry is used for astigmatism planning.
abstract: OBJECTIVE
  To evaluate clinical outcomes when toric intraocular lens (IOL) calculations are based on the keratometric output from the Lenstar LS-900 dual zone automated keratometer (Haag-Streit AG, Koeniz, Switzerland).
  
  
  METHODS
  Eligible subjects presenting for toric IOL implantation at five sites were measured with a dual-zone automated keratometer. The data were used to plan the power and angle of the toric IOL to be implanted. Refractive and visual acuity status were checked at 1 and 3 months postoperatively.
  
  
  RESULTS
  A total of 102 eyes had relevant data for analysis. More than 76% of eyes had 0.50 diopter or less of refractive astigmatism at 1 and 3 months, with no difference by level of astigmatism corrected. More than half of the eyes had uncorrected distance visual acuity of 20/20 or better and 78% were 20/25 or better. A new measure of effectiveness of toric correction power is described that suggested lens selection was appropriate. Results appeared better than those obtained in previous studies when the IOL cylinder power and alignment were calculated using manual keratometry.
  
  
  CONCLUSIONS
  In this series of eyes from multiple centers, the calculation of toric IOL power using dual-zone automated keratometry measurements produced clinical results that were better than results in the literature where manual keratometry was used.
authors.forename: Richard
authors.initials: R
authors.lastname: Potvin
authors.forename: Kjell Gunnar
authors.initials: KG
authors.lastname: Gundersen
authors.forename: Samuel
authors.initials: S
authors.lastname: Masket
authors.forename: Robert H
authors.initials: RH
authors.lastname: Osher
authors.forename: Michael E
authors.initials: ME
authors.lastname: Snyder
authors.forename: Robin
authors.initials: R
authors.lastname: Vann
authors.forename: Kerry D
authors.initials: KD
authors.lastname: Solomon
authors.forename: Warren E
authors.initials: WE
authors.lastname: Hill
mesh_terms: D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D001699:Biometry; D003315:Cornea / Q000503:physiopathology; D063171:Corneal Pachymetry; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D055095:Optics and Photonics; D018918:Phacoemulsification; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology