title: Femtosecond laser-assisted intrastromal arcuate keratotomy to reduce corneal astigmatism.
abstract: OBJECTIVE
  To report the initial results of intrastromal arcuate keratotomy performed with a femtosecond laser to treat corneal astigmatism.
  
  
  METHODS
  Department of Ophthalmology, Paracelsus Medical University, Salzburg, Austria.
  
  
  METHODS
  Interventional case series.
  
  
  METHODS
  Patients with corneal astigmatism (naturally occurring or after cataract surgery) were treated with an iFS femtosecond laser to perform paired arcuate cuts on the steep axis completely placed within the corneal stroma. Patients were followed for 6 months after surgery. Preoperative and postoperative (1-day, 1-week, and 1-, 3-, and 6-month) examinations included corrected and uncorrected visual acuities, manifest refraction, corneal topography, endothelial cell count, and corneal pachymetry. A subjective questionnaire was used to evaluate patient satisfaction.
  
  
  RESULTS
  The study enrolled 16 patients. No perforations occurred, and all incisions were placed at the planned locations. After a 6-month follow-up, the mean refractive cylinder was reduced significantly from 1.41 diopters (D) ± 0.66 (SD) to 0.33 ± 0.42 D (P<.001). The mean topographic astigmatism was reduced significantly from 1.50 ± 0.47 D preoperatively to 0.63 ± 0.34 D at 6 months (P=.002). There was excellent refractive and topographic stability over time. The endothelial cell density was unchanged. Patient satisfaction was very high.
  
  
  CONCLUSIONS
  The femtosecond laser allowed the effective creation of precise, purely intrastromal, arcuate incision patterns with an excellent safety profile, rapid recovery, and stability of vision without the known risks associated with incisions that penetrate Bowman membrane.
authors: Department of Ophthalmology, Paracelsus Medical University, Salzburg, Austria. t.rueckl@salk.at
authors: Theresa
authors: T
authors: Rückl
authors: Alois K
authors: AK
authors: Dexl
authors: Alexander
authors: A
authors: Bachernegg
authors: Veronika
authors: V
authors: Reischl
authors: Wolfgang
authors: W
authors: Riha
authors: Josef
authors: J
authors: Ruckhofer
authors: Perry S
authors: PS
authors: Binder
authors: Günther
authors: G
authors: Grabner
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000503:physiopathology / Q000601:surgery*; D003319:Corneal Stroma / Q000503:physiopathology / Q000601:surgery*; D048988:Corneal Surgery, Laser / Q000379:methods*; D019781:Corneal Topography; D005240:Feasibility Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology