title: Photorefractive keratectomy for myopia with -8.00 diopter cylindrical correction.
abstract: OBJECTIVE
  A colleague requested PRK. The last time the patient was seen, no spectacles or contact lenses were worn. However, subjective refraction was -7.00 -5.50 x 165 degrees. The original Nidek nomogram would have suggested setting the laser at the actual refraction. Our algorithm adjustments suggested a 40% extra correction of cylinder would be required. The laser was therefore set to -3.50 -8.00 x 165 degrees aiming for a -1.00 -2.00 x 165 degrees outcome to allow for possible retreatment.
  
  
  METHODS
  A 165 micron depth ablation was performed.
  
  
  CONCLUSIONS
  At 6 weeks after surgery, visual acuity was 0.63 unaided with a refraction of +1.50 -1.75 x 170 degrees on pred forte.
authors.affiliation: Optimax Laser Eye Clinic, Manchester, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Shah
authors.forename: A
authors.initials: A
authors.lastname: Chatterjee
mesh_terms: D000328:Adult; D003315:Cornea / Q000601:surgery*; D005260:Female; D006801:Humans; D054018:Lasers, Excimer; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular; D016896:Treatment Outcome; D014792:Visual Acuity