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

DOI: 10.1590/S0004-27492012000200011

Keywords: corneal topography, cornea [pathology], astigmatism [physiopathology], keratoconus [physiopathology], keratoconus [surgery], lasers, excimer [therapeutic use], prosthesis implantantion, refraction, ocular, visual acuity.

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Abstract:

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.

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