title: Presence and distribution of hyaluronan in human corneas after phototherapeutic keratectomy.
abstract: OBJECTIVE
  To evaluate the reactive hyaluronan (HA) formation in the human cornea following excimer laser surgery.
  
  
  METHODS
  Fourteen patients underwent phototherapeutic keratectomy in order to remove corneal opacifications caused by a range of diseases. A penetrating corneal transplantation was performed between 6 and 44 months later because of unsatisfactory visual outcome. The corneal buttons were fixed in 4% formaldehyde containing 1% cetylpyridine chloride. The histological sections were stained for the presence of hyaluronan.
  
  
  RESULTS
  Hyaluronan was found in the subepithelial region of the ablated area in thirteen out of fourteen human corneal specimens It was present as long as 44 months after surgery and it is found despite of topical steroid treatment postoperatively.
  
  
  CONCLUSIONS
  The human cornea commonly reacts to excimer laser surgery by the formation of hyaluronan.
authors.affiliation: St. Eriks Eye Hospital, Karolinska Institute, Stockholm, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Weber
authors.forename: P
authors.initials: P
authors.lastname: Fagerholm
mesh_terms: D000328:Adult; D000368:Aged; D002387:Cataract Extraction; D003315:Cornea / Q000378:metabolism* / Q000601:surgery*; D006651:Histocytochemistry; D006801:Humans; D006820:Hyaluronic Acid / Q000378:metabolism*; D053685:Laser Therapy; D008875:Middle Aged; D011184:Postoperative Period; D014018:Tissue Distribution
chemical_list: D006820:Hyaluronic Acid