title: Corneal flap thickness with the Moria M2 single-use head 90 microkeratome.
abstract: OBJECTIVE
  To analyse the accuracy of corneal flap thickness created in laser-assisted in situ keratomileusis (LASIK) using the Moria Model 2 (M2) single-use head 90 microkeratome.
  
  
  METHODS
  The corneal thickness of 300 (266 myopic and 34 hyperopic) eyes of 150 patients was measured by ultrasonic pachymetry preoperationally and intraoperationally after flap cut. The Moria M2 single-use head 90, intended to create a flap with a thickness of 120 microm, was used in all eyes. The right eye was always operated first and the left eye second, using the same blade.
  
  
  RESULTS
  Mean corneal flap thickness was 115.4 microm (standard deviation [SD] 12.5) in the two eyes, 115.7 microm (SD 12.4, range 73-147 microm) in right eyes and 115.1 microm (SD 12.6, range 74-144 microm) in left eyes. Mean horizontal flap diameter was 9.1 mm (SD 0.2) and mean hinge length 4.1 mm (SD 0.1). There were no free flaps, incomplete flaps or flaps with buttonholes in the study. Occasional iron particles were observed in three (1.0%) eyes.
  
  
  CONCLUSIONS
  As with most microkeratomes, the single-use head 90 microkeratome cut thinner flaps than were intended. The range of the cuts was relatively wide. However, thin flaps did not increase the rate of flap-related complications. The difference between the first and second eyes was not significant.
authors.affiliation: Mehiläinen Eye Surgery Clinic, Tampere, Finland. anne.huhtala@uta.fi
authors.forename: Anne
authors.initials: A
authors.lastname: Huhtala
authors.forename: Juhani
authors.initials: J
authors.lastname: Pietilä
authors.forename: Petri
authors.initials: P
authors.lastname: Mäkinen
authors.forename: Sakari
authors.initials: S
authors.lastname: Suominen
authors.forename: Matti
authors.initials: M
authors.lastname: Seppänen
authors.forename: Hannu
authors.initials: H
authors.lastname: Uusitalo
mesh_terms: D000293:Adolescent; D000328:Adult; D003319:Corneal Stroma / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D004209:Disposable Equipment; D006801:Humans; D006956:Hyperopia / Q000503:physiopathology / Q000601:surgery*; D020731:Keratomileusis, Laser In Situ / Q000295:instrumentation*; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D012029:Refraction, Ocular / Q000502:physiology; D015203:Reproducibility of Results; D013524:Surgical Flaps / Q000473:pathology*; D014463:Ultrasonography