title: [Analysis of influence of axial length and keratometric value on the curative effects of excimer laser photorefractive keratectomy for myopia].
abstract: OBJECTIVE
  To evaluate the influence of axial length (AL) and keratometric value (KV) on the curative effects of excimer laser photorefractive keratectomy (PRK) for myopia.
  
  
  METHODS
  A Keracor-17 excimer laser was used to treat 80 patients (121 eyes) with myopia. The cases were divided into three groups according to the AL and KV: The first group AL > 26 mm, KV <or= 45 D, 49 eyes; the second group AL <or= 26 mm, KV > 45 D, 36 eyes; the third group AL <or= 26 mm, KV <or= 45 D, 36 eyes. The curative effects were investigated.
  
  
  RESULTS
  The mean uncorrected visual acuity was 1.05 +/- 0.31, which had no significant difference among three groups (P > 0.05). The cases with uncorrected visual acuity >or= 0.5 had significant difference between the first and the second group and between the first and the third group (chi(2) = 6.30, P < 0.05). Multiple linear regression and correlative analysis showed that the increase in ocular axis was an unfavorable factor to visual acuity, while the increase in keratometric value was a favorable factor to visual acuity.
  
  
  CONCLUSIONS
  PRK for treatment of myopia is an effective and safe refractive surgery. When the myopic degrees are identical, the postoperative outcome of myopia with increase in keratometric value as the main pathogeny is better than the myopia with increase in axial length as the main pathogeny.
authors.affiliation: Department of Ophthalmology, The First Affiliated Hospital, Suzhou Medical College, Suzhou 215006, China.
authors.forename: J
authors.initials: J
authors.lastname: Ding
authors.forename: W
authors.initials: W
authors.lastname: Shen
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Pan
authors.forename: X
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D003315:Cornea / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods*; D012029:Refraction, Ocular; D016896:Treatment Outcome; D014792:Visual Acuity