title: Correction of asymmetric myopic astigmatism with laser in situ keratomileusis.
abstract: BACKGROUND
  There are many ways to correct different kinds of astigmatism (myopic, hyperopic, mixed) with excimer laser surgery. New methods of correction are under development, including toric ablation in both meridians. Corneal astigmatism may also be present in asymmetric forms.
  
  
  METHODS
  Twenty-one eyes of 16 patients (5 male, 11 female) with asymmetric myopic astigmatism were studied. The spherical component ranged from -2.75 to -9.25 D (mean, -6.15 +/- 0.63 D), and the cylinder ranged from 0.75 to 5.00 D (mean, 1.80 +/- 0.13 D). Mean age was 33 years. All patients underwent laser in situ keratomileusis (LASIK) using the Nidek EC-5000 excimer laser and the Hansatome microkeratome (TM 230 HT).
  
  
  RESULTS
  Three months after LASIK, average spherical component was -0.50 +/- 0.05 D, and mean cylinder was -0.52 +/- 0.05 D. Uncorrected visual acuity (0.92 +/- 0.096) was close to average preoperative spectacle-corrected visual acuity (0.99 +/- 0.099). No patients reported double vision.
  
  
  CONCLUSIONS
  When treating asymmetric forms of myopic astigmatism, it is possible to obtain good clinical outcomes by decentering the toric ablation and calculating the value and axis of the cylinder using topographic data.
authors: New Line Vision Ophthalmology Research Center, Moscow, Russia.
authors: V
authors: V
authors: Cheloudtchenko
authors: V
authors: V
authors: Kourenkov
authors: T
authors: T
authors: Fadeikina
mesh_terms: D001251:Astigmatism / Q000150:complications / Q000473:pathology / Q000601:surgery*; D003315:Cornea / Q000473:pathology / Q000601:surgery*; D019781:Corneal Topography; D016039:Corneal Transplantation / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053685:Laser Therapy; D008297:Male; D009216:Myopia / Q000150:complications / Q000473:pathology / Q000601:surgery*; D012029:Refraction, Ocular; D016896:Treatment Outcome; D014792:Visual Acuity