title: Analysis of photoastigmatic keratectomy with the cross-cylinder ablation.
abstract: OBJECTIVE
  The aim was to evaluate the safety and efficacy of the "cross-cylinder" technique in the correction of astigmatism.
  
  
  METHODS
  A prospective interventional study from a university eye department was conducted.
  
  
  METHODS
  The photoastigmatic refractive keratectomy (PARK) using the "cross-cylinder" technique was performed in 102 eyes of 84 patients with at least 0.75 D of astigmatism. The study population was divided into two groups: in the first group the preoperative astigmatic power ranged from -0.75 D to -3.00 D (group 1), in the second group it ranged from -3.25 D to -6.00 D (group 2). Group 1 included 82 eyes of 67 patients (29 males and 38 females) with a mean cylinder power of -1.90 ± 0.63 D, group 2 included 20 eyes of 17 patients (13 males and 4 females) with a mean cylinder power of -4.28 ± 0.76 D. All eyes were targeted for emmetropia. The results were evaluated using Calossi's vector analysis method. Six-month postoperative outcomes are presented.
  
  
  RESULTS
  Six months after PARK the mean sphere for the entire cohort was +0.28 ± 0.75 D (range +2.5 to -2 D), the mean cylindrical power was +0.33 ± 0.51 D (range +2.5 to -1.25 D) and the mean spherical equivalent refraction was +0.73 ± 0.81 D (range +1.75 to -2 D).
  
  
  CONCLUSIONS
  The cross-cylinder technique may be safely used with predictable results for the correction of astigmatism.
authors: Eye Department, and Centro Grandi Apparecchiature, 2nd University of Naples, Via De Crecchio 16, Naples, Italy.
authors: Nicola
authors: N
authors: Rosa
authors: Maddalena
authors: M
authors: De Bernardo
authors: Mario R
authors: MR
authors: Romano
authors: Gianluca
authors: G
authors: Scarfato
authors: Francesco
authors: F
authors: Verdoliva
authors: Rodolfo
authors: R
authors: Mastropasqua
authors: Michele
authors: M
authors: Lanza
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D003315:Cornea / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods*; D011446:Prospective Studies; D012029:Refraction, Ocular; D016896:Treatment Outcome