title: Corneal Biomechanical Changes After Myopic Photorefractive Keratectomy.
abstract: OBJECTIVE
  To study the corneal biomechanical and morphological changes after photorefractive keratectomy (PRK) and the correlation with morphological parameters.
  
  
  METHODS
  119 eyes of 75 subjects with a refraction ranging between -0.50 D and -14.50 D (mean = -4.7 ± 2.3 D) were included in this study. The differences in corneal hysteresis (CH) and corneal resistance factor (CRF) one, three, and six months after PRK have been correlated with effective treatment, central corneal thickness (CCT), and corneal volume (CV) variations at any follow-up utilizing the Pearson Index. Differences between preoperative and postoperative values of the analyzed parameters have been checked with Student T test.
  
  
  RESULTS
  Both CH and CRF showed a significant (p < 0.01) decrease at one, three, and six months' follow-up.
  
  
  CONCLUSIONS
  Our findings suggest that after myopic PRK there is a significant decrease of CH and CRF immediately after treatment that remains stable over the follow-up.
authors: a Department of Medicine and Surgery , University of Salerno , Salerno , Italy .
authors: Nicola
authors: N
authors: Rosa
authors: a Department of Medicine and Surgery , University of Salerno , Salerno , Italy .
authors: Maddalena
authors: M
authors: De Bernardo
authors: b Multidisciplinary Department of Medical , Surgical and Dental Specialities, Seconda Università di Napoli , Napoli , Italy , and.
authors: Stefania
authors: S
authors: Iaccarino
authors: b Multidisciplinary Department of Medical , Surgical and Dental Specialities, Seconda Università di Napoli , Napoli , Italy , and.|c Centro Grandi Apparecchiature, Seconda Università di Napoli , Napoli , Italy.
authors: Michele
authors: M
authors: Lanza
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology; D003315:Cornea / Q000503:physiopathology*; D063171:Corneal Pachymetry; D004548:Elasticity / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008297:Male; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D018903:Photorefractive Keratectomy; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology
keywords: Corneal hysteresis; corneal resistance factor; corneal thickness; myopia; photorefractive keratectomy