title: Comparison of 2 intrastromal corneal ring segment models in the management of keratoconus.
abstract: OBJECTIVE
  To compare the outcomes of implantation of 2 models of intrastromal corneal ring segments (ICRS) to manage keratoconus.
  
  
  METHODS
  Kartal Training and Research Hospital, Istanbul, Turkey.
  
  
  METHODS
  This study evaluated eyes with keratoconus that had implantation of Keraring ICRS (Group A) or Intacs ICRS (Group B). The corneal tunnels were created mechanically or with a femtosecond laser. The uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, keratometry (K) readings (Orbscan II), and complications in the 2 groups were compared.
  
  
  RESULTS
  Group A comprised 100 eyes and Group B, 68 eyes. The postoperative increase in UDVA and CDVA was statistically significant in both groups (P<.05). Group A had greater improvement in CDVA than Group B at 6 months and 1 year (both P<.001). At 1 year, the decrease in the mean maximum K power was statistically significant in Group A (51.27 diopters [D] +/- 4.46 [SD] to 47.87 +/- 3.39 D) and in Group B (51.12 +/- 4.54 D to 47.58 +/- 3.66 D) (P<.05). The mean reduction in maximum K was statistically significantly greater in Group A at 6 months and 1 year (P = .018 and P = .024, respectively). There were no statistically significant differences in visual or refractive results between femtosecond laser and mechanical tunnel creation.
  
  
  CONCLUSIONS
  Although both ICRS models were effective and safe in managing keratoconus, the Keraring ICRS led to more improvement in CDVA and UDVA and a greater reduction in the maximum K value.
authors.affiliation: Dr. Lütfi Kirdar Kartal Training and Research Hospital, Istanbul, Turkey.
authors.forename: Anil
authors.initials: A
authors.lastname: Kubaloglu
authors.forename: Yasin
authors.initials: Y
authors.lastname: Cinar
authors.forename: Esin Sogutlu
authors.initials: ES
authors.lastname: Sari
authors.forename: Arif
authors.initials: A
authors.lastname: Koytak
authors.forename: Burak
authors.initials: B
authors.lastname: Ozdemir
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Ozertürk
mesh_terms: D000293:Adolescent; D000328:Adult; D001672:Biocompatible Materials; D003315:Cornea / Q000503:physiopathology; D003319:Corneal Stroma / Q000601:surgery*; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D007640:Keratoconus / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011379:Prognosis; D019736:Prostheses and Implants; D011474:Prosthesis Design; D019919:Prosthesis Implantation; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult
chemical_list: D001672:Biocompatible Materials