Femtosecond assisted intrastromal corneal ring (ISCR) implantation for the treatment of corneal ectasia

• Published in: Arquivos brasileiros de oftalmologia 2012-03, Vol.75 (2), p.126-130
• Main Authors: Coimbra, Cristina Cardoso, Gomes, Marcos Tonelli, Campos, Mauro, Figueiroa, Jr, Edvaldo Soter de, Barbosa, Eduardo Parente, Santos, Myrna Serapião dos
• Format: Article
• Language: English
• Subjects: Adult; Corneal Topography; Female; Follow-Up Studies; Humans; Keratoconus - surgery; Male; Prosthesis Implantation - methods; Refraction, Ocular; Retrospective Studies; Severity of Illness Index; Treatment Outcome; Visual Acuity
• ISSN: 0004-2749; 1678-2925
• DOI: 10.1590/S0004-27492012000200011

To assess the outcomes of intrastromal corneal ring (ISCR) implantation for the treatment of corneal ectasia. Thirty-five consecutive patients with secondary corneal ectasia treated with keraring intrastromal corneal ring segment implantation aided by intralaser femtosecond technique (K-ICRS-FS) were evaluated. Visual acuity (logMAR), refraction and astigmatism vector analysis were measured preoperatively and 3 months postoperatively using vector analysis as described by some authors. Visual acuity improved from 0.40 ± 0.20 to 0.25 ± 0.13 logMAR (p=0.0002), with reduction of the spherical equivalent from -5.41 ± 4.78 D to -2.83 ± 3.29 D (P=0.0002). Mean astigmatism reduction was 3.92 ± 2.52 D. K maximum decreased from 51.65 ± 5.83 D preoperatively to 48.58 ± 5.54 D (p=0.001) 3 months after the surgery and K minimum decreased from 45.92 ± 4.64 D to 43.96 ± 5.06 D (p=0.0041). There were no intraoperative or postoperative complications. Intrastromal corneal ring implantation with the use of a femtosecond laser was a safe procedure, with low risk of complications and significant improvement on visual acuity and topographic data in this seeting of patients with secondary corneal ectasia.