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Arquivos Brasileiros de Oftalmologia
Print version ISSN 0004-2749
COIMBRA, Cristina Cardoso et al. Femtosecond assisted intrastromal corneal ring (ISCR) implantation for the treatment of corneal ectasia. Arq. Bras. Oftalmol. [online]. 2012, vol.75, n.2, pp. 126-130. ISSN 0004-2749. http://dx.doi.org/10.1590/S0004-27492012000200011.
PURPOSE: To assess the outcomes of intrastromal corneal ring (ISCR) implantation for the treatment of corneal ectasia. METHODS: 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. RESULTS: 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. CONCLUSION: 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.
Keywords : Corneal topography; Cornea [pathology]; Astigmatism [physiopathology]; Keratoconus [physiopathology]; Keratoconus [surgery]; Lasers, excimer [therapeutic use]; Prosthesis implantantion; Refraction, ocular; Visual acuity.