title: [Study of diopters-cutting in treatment of PRK for myopia].
abstract: OBJECTIVE
  To study a method of determining the diopters-cutting for photorefractive keratectomy (PRK) pre-operation.
  
  
  METHODS
  By statistics, to analyze the differences of diopter between optometry of mydriasis and keratectomy in 143 cases 209 eyes of medium myopia with complete data recorded.
  
  
  RESULTS
  The average diopter for optometry of mydriasis is -4.32 D, for keratectomy, -4.74 D. The average of differences is (0.42 +/- 0.173) D, P < 0.01.
  
  
  CONCLUSIONS
  The numerical value of diopter-cutting for operation should be higher than for optometry of mydriasis in treatment of PRK for myopia.
authors.affiliation: Department of Ophthalmology, Shantou Central Hospital, Guangdong 515031, China.
authors.forename: Zicai
authors.initials: Z
authors.lastname: Huang
authors.forename: Zhongxia
authors.initials: Z
authors.lastname: Zhou
authors.forename: Suyan
authors.initials: S
authors.lastname: Chen
authors.forename: Hongni
authors.initials: H
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Shuwen
authors.initials: S
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D003315:Cornea / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D009184:Mydriatics; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods; D011680:Pupil / Q000187:drug effects; D012029:Refraction, Ocular
chemical_list: D009184:Mydriatics