title: Centration on the cornea vertex normal during hyperopic refractive photoablation using videokeratoscopy.
abstract: OBJECTIVE
  To evaluate a method for centering the ablation in standard hyperopic LASIK using an excimer laser with a video-based eye tracker system.
  
  
  METHODS
  Results of 52 consecutive hyperopic eyes treated with the ESIRIS excimer laser were retrospectively reviewed. Ablation was shifted from the pupil center to the vertex normal of the cornea using pupillary offset measured with the Keratron Scout videokeratoscope. Outcomes were assessed 3 months postoperatively.
  
  
  RESULTS
  All eyes preoperatively had a nasally oriented vertex normal in relation to the pupil center. Three months postoperatively a refractive outcome of < 0.50 diopters of spherical equivalent was achieved in 94% (49/52) of eyes. No eye lost more than one line of best spectacle-corrected visual acuity.
  
  
  CONCLUSIONS
  Standard hyperopic LASIK with the ESIRIS laser system leads to good predictable efficacy and safety results when the ablation center is shifted to the cornea vertex normal based on videokeratoscopy data.
authors.affiliation: Augenlaserzentrum Recklinghausen, Germany. Diego.de.Ortueta@augenzentrum.org
authors.forename: Diego
authors.initials: D
authors.lastname: de Ortueta
authors.forename: Frank D
authors.initials: FD
authors.lastname: Schreyger
mesh_terms: D000328:Adult; D000368:Aged; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006956:Hyperopia / Q000473:pathology / Q000601:surgery*; D007430:Intraoperative Care / Q000379:methods*; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D016896:Treatment Outcome