title: Complications of intrastromal corneal ring segment implantation using a femtosecond laser for channel creation: a survey of 850 eyes with keratoconus.
abstract: OBJECTIVE
  To report complications after the implantation of intrastromal corneal ring segments (Keraring; Mediphacos, Belo Horizonte, Brazil) in keratoconic eyes using a femtosecond laser (IntraLase; Advanced Medical Optics, Santa Ana, California, USA) for channel creation.
  
  
  METHODS
  Retrospective chart review of 531 patients (850 eyes) who underwent Keraring insertion using a femtosecond laser for channel creation. Intraoperative and postoperative complications were recorded.
  
  
  RESULTS
  Intraoperatively, there were 22 (2.7%) cases of incomplete channel formation. The rest of the intraoperative complications were galvo lag error (system malfunction) [five eyes (0.6%)], endothelial perforation [five eyes (0.6%)] and incorrect entry of the channel [two eyes (0.2%)]. Postoperatively, there were 11 (1.3%) cases of segment migration, two (0.2%) cases of corneal melting and one (0.1%) case of mild infection. The overall complication rate was 5.7% (49 cases out of 850 eyes).
  
  
  CONCLUSIONS
  In this study, intracorneal ring segment implantation using a femtosecond laser for channel creation was related to a number of complications. The most common complications were incomplete channel creation (intraoperatively) and segment migration (postoperatively).
authors.affiliation: Dunya Eye Hospital, Istanbul, Turkey.
authors.forename: Efekan
authors.initials: E
authors.lastname: Coskunseven
authors.forename: George D
authors.initials: GD
authors.lastname: Kymionis
authors.forename: Nikolaos S
authors.initials: NS
authors.lastname: Tsiklis
authors.forename: Serife
authors.initials: S
authors.lastname: Atun
authors.forename: Ebru
authors.initials: E
authors.lastname: Arslan
authors.forename: Charalambos S
authors.initials: CS
authors.lastname: Siganos
authors.forename: Mirco
authors.initials: M
authors.lastname: Jankov
authors.forename: Ioannis G
authors.initials: IG
authors.lastname: Pallikaris
mesh_terms: D000293:Adolescent; D000328:Adult; D003319:Corneal Stroma / Q000601:surgery*; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D007640:Keratoconus / Q000601:surgery*; D053685:Laser Therapy; D053844:Lasers, Solid-State; D008297:Male; D011183:Postoperative Complications; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D012189:Retrospective Studies; D014792:Visual Acuity; D055815:Young Adult