title: Keratocyte density in the retroablation area after LASEK for the correction of myopia.
abstract: OBJECTIVE
  During excimer laser photoablation keratocyte cell death is induced in the retroablation area. Afterwards this area is repopulated by keratocyte mitosis and migration from the adjacent stroma. The aim of this study was to investigate keratocyte density in the retroablation area and in the posterior stroma during the first year after LASEK for the correction of myopia.
  
  
  METHODS
  In a prospective study LASEK surgery was performed in 17 eyes of 10 consecutive patients for the correction of myopia (-2.25 D to -9.0 D, mean -5.0 D). Confocal microscopy (Nidek Confoscan 2) was performed before surgery and 1 month, 3 months, 6 months and 12 months after LASEK. Keratocyte density was assessed in the anterior retroablation area at depths of 5 mum and 25 mum and in the posterior stroma at distances of 5 mum and 100 mum from the corneal endothelium and compared with the corresponding area before surgery.
  
  
  RESULTS
  Keratocyte density was statistically significant reduced in the retroablation area at all timepoints after LASEK. At a depth of 5 mum, cell densities were decreased by 64%, 47%, 43%, and 28% at 1 month, 3 months, 6 months and 12 months after LASEK compared with preoperative values. At a depth of 25 mum, cell densities were decreased by 51%, 32%, 28%, and 18% at 1 month, 3 months, 6 months and 12 months after LASEK compared with preoperative values. In the posterior stroma no significant change in keratocyte density was observed at any time after LASEK.
  
  
  CONCLUSIONS
  Keratocyte density in the anterior retroablation area recovers during the first year after LASEK for the correction of myopia, but does not go back to preoperative values.
authors.affiliation: University Eye Clinic, University of Regensburg, Franz-Josef-Strauss Allee 11, 93042, Regensburg, Germany. Herrmann@eye-regensburg.de
authors.forename: Wolfgang Artur
authors.initials: WA
authors.lastname: Herrmann
authors.forename: Manuela
authors.initials: M
authors.lastname: Muecke
authors.forename: Michael
authors.initials: M
authors.lastname: Koller
authors.forename: Veit Peter
authors.initials: VP
authors.lastname: Gabel
authors.forename: Chris Patrick
authors.initials: CP
authors.lastname: Lohmann
mesh_terms: D000328:Adult; D002452:Cell Count; D003319:Corneal Stroma / Q000473:pathology* / Q000601:surgery*; D005260:Female; D005347:Fibroblasts / Q000473:pathology; D006801:Humans; D049008:Keratectomy, Subepithelial, Laser-Assisted; D008297:Male; D018613:Microscopy, Confocal; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011184:Postoperative Period; D011446:Prospective Studies; D014945:Wound Healing