title: Assessment of intrastromal corneal ring segment position with anterior segment optical coherence tomography.
abstract: OBJECTIVE
  To examine the exact position of implanted Keraring (Mediphacos, Belo Horizonte, Brazil) segments by high-resolution anterior segment optical coherence tomography (AS-OCT).
  
  
  METHODS
  This study included 17 eyes of 13 patients with keratoconus who underwent uneventful intracorneal ring segment implantation with the aid of femtosecond laser. Eyes were evaluated by AS-OCT at the third postoperative month. Distance from the apex of the triangular cross-section of the ring segment to the anterior corneal surface and distances from two basal corners to the posterior corneal surface were measured.
  
  
  RESULTS
  Distance from apex to anterior corneal surface (263.1 ± 42.9 μm) was significantly smaller than target depth calculated intraoperatively (356.9 ± 35.7 μm, P < .001). Distance between outer basal corner and posterior corneal surface was significantly greater than distance between inner basal corner and posterior corneal surface.
  
  
  CONCLUSIONS
  High-resolution AS-OCT is a rapid, convenient, and valuable technique in the follow-up of patients with implanted Keraring segments that may be helpful in predicting ring-related complications.
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Yeditepe University, Istanbul, Turkey. ebrugorgun@gmail.com
authors.forename: Ebru
authors.initials: E
authors.lastname: Gorgun
authors.forename: Raciha Beril
authors.initials: RB
authors.lastname: Kucumen
authors.forename: Nursal Melda
authors.initials: NM
authors.lastname: Yenerel
authors.forename: Ferda
authors.initials: F
authors.lastname: Ciftci
mesh_terms: D000328:Adult; D003319:Corneal Stroma / Q000473:pathology / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis / Q000601:surgery*; D053685:Laser Therapy / Q000379:methods; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D012029:Refraction, Ocular / Q000502:physiology; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult