title: Single intrastromal corneal ring segment implantation using the femtosecond laser after radial keratotomy in a keratoconic patient.
abstract: A 33-year-old woman with irregular astigmatism 6 years after radial keratotomy (RK) for keratoconus was treated with implantation of a single intrastromal corneal ring segment (Keraring) using the femtosecond laser. The segment (0.150 mm thick with a 160-degree arc) was inserted in the steepest area (inferior) with no intraoperative or postoperative complications. Six months postoperatively, the uncorrected visual acuity had improved from 20/40 to 20/25 and the best spectacle-corrected visual acuity, from 20/32 to 20/20. The mean manifest astigmatic correction decreased from -2.50 diopters (D) to -0.75 D, and corneal topography showed improved inferior steepening and less irregular astigmatism. Although the results are encouraging, the long-term effect of this approach in post-RK patients is not known.
authors.affiliation: World 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: Dimitrios I
authors.initials: DI
authors.lastname: Bouzoukis
authors.forename: Ebru
authors.initials: E
authors.lastname: Aslan
authors.forename: Ioannis
authors.initials: I
authors.lastname: Pallikaris
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000209:etiology / Q000601:surgery*; D003319:Corneal Stroma / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000601:surgery*; D007646:Keratotomy, Radial / Q000009:adverse effects*; D011183:Postoperative Complications; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D014792:Visual Acuity