title: Changes in ocular biomechanics after femtosecond laser creation of a laser in situ keratomileusis flap.
abstract: OBJECTIVE
  To evaluate ocular biomechanical parameters with the Corvis ST, a noncontact tonometer combined with an ultra-high-speed Scheimpflug camera, before and after creation of a femtosecond laser-created laser in situ keratomileusis (LASIK) flap.
  
  
  METHODS
  Private practice, Siena, Italy.
  
  
  METHODS
  Prospective consecutive study.
  
  
  METHODS
  Right eyes of patients having LASIK were assessed with the dynamic Scheimpflug camera before and after femtosecond laser (LDV Z4) flap creation but before mechanical flap lifting.
  
  
  RESULTS
  Twenty-eight eyes of 28 patients were evaluated. Before flap creation, the mean values on the dynamic Scheimpflug camera were intraocular pressure (IOP), 15.04 mm Hg ± 3.99 (SD); central pachymetry, 550.8 ± 101.0 μm; applanation 1 length, 1.721 ± 0.134 mm; applanation 2 length, 1.674 ± 0.287 mm; applanation 1 velocity, 0.126 ± 0.031 m/s; and deflection amplitude, 1.039 ± 0.141 mm. After flap creation, the mean values were IOP, 16.10 ± 3.11 mm Hg (95% confidence interval [CI], 0.44-1.78; P < .05); central pachymetry, 561.8 ± 35.9 μm (95% CI, -28.9 to 50.9; P = .21); applanation 1 length, 1.789 ± 0.1492 mm (95% CI, 0.003-0.134; P < .05); applanation 2 length, 1.759 ± 0.259 mm (95% CI, -0.005 to 0.173; P = .08); applanation 1 velocity, 0.136 ± 0.022 m/s (95% CI, 0.001-0.017; P < .05); and deflection amplitude, 1.029 ± 0.151 mm (95% CI: -0.043 to 0.025; P = .34).
  
  
  CONCLUSIONS
  The dynamic Scheimpflug camera showed changes in biomechanical properties after femtosecond creation of a LASIK flap as indicated by an increased applanation 1 length and applanation 1 velocity.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti, J. Moore, Shah, T.C.B. Moore), University of Ulster, Coleraine, Midland Eye (Shah), Solihull, and the Cathedral Eye Clinic (Moore), Belfast, Northern Ireland, United Kingdom. Electronic address: leccisotti@libero.it.
authors.forename: Antonio
authors.initials: A
authors.lastname: Leccisotti
authors.affiliation: From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti, J. Moore, Shah, T.C.B. Moore), University of Ulster, Coleraine, Midland Eye (Shah), Solihull, and the Cathedral Eye Clinic (Moore), Belfast, Northern Ireland, United Kingdom.
authors.forename: Stefania V
authors.initials: SV
authors.lastname: Fields
authors.affiliation: From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti, J. Moore, Shah, T.C.B. Moore), University of Ulster, Coleraine, Midland Eye (Shah), Solihull, and the Cathedral Eye Clinic (Moore), Belfast, Northern Ireland, United Kingdom.
authors.forename: Johnny
authors.initials: J
authors.lastname: Moore
authors.affiliation: From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti, J. Moore, Shah, T.C.B. Moore), University of Ulster, Coleraine, Midland Eye (Shah), Solihull, and the Cathedral Eye Clinic (Moore), Belfast, Northern Ireland, United Kingdom.
authors.forename: Sunil
authors.initials: S
authors.lastname: Shah
authors.affiliation: From the Siena Eye Laser (Leccisotti, Fields), Poggibonsi, Siena, Italy; the School of Biomedical Sciences (Leccisotti, J. Moore, Shah, T.C.B. Moore), University of Ulster, Coleraine, Midland Eye (Shah), Solihull, and the Cathedral Eye Clinic (Moore), Belfast, Northern Ireland, United Kingdom.
authors.forename: Tara C B
authors.initials: TC
authors.lastname: Moore
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D003315:Cornea / Q000502:physiology*; D063171:Corneal Pachymetry; D003319:Corneal Stroma / Q000601:surgery; D019781:Corneal Topography; D004548:Elasticity / Q000502:physiology*; D005260:Female; D006801:Humans; D006956:Hyperopia / Q000601:surgery; D007429:Intraocular Pressure / Q000502:physiology; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery; D011446:Prospective Studies; D012029:Refraction, Ocular; D013524:Surgical Flaps; D014065:Tonometry, Ocular; D014792:Visual Acuity; D055815:Young Adult