June 23, 2014
1 min read

Ring segments, cross-linking improve vision in eyes with post-LASIK corneal ectasia

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Intrastromal corneal ring segment implantation combined with corneal collagen cross-linking improved vision and refraction in eyes with corneal ectasia after LASIK, according to a study.

The retrospective study included 16 eyes of 14 patients who underwent femtosecond laser-assisted implantation of a KeraRing (Mediphacos) and same-day cross-linking. Primary outcome measures were logMAR uncorrected and corrected distance visual acuity, spherical and cylindrical refraction, and simulated keratometry values. Mean follow-up was 43 months.

Uncorrected distance visual acuity improved significantly, from 1.18 to 0.44 (P < .001). Corrected distance visual acuity improved from 0.46 to 0.21; both improvements were statistically significant, according to the researchers (P < .001).

Mean sphere was reduced by 3.18 D, and mean cylinder was reduced by 1.90 D; both decreases were also significant (P < .001).

At final follow-up, spherical refraction decreased by 1 D or more in nine eyes and changed by less than 1 D in seven eyes. Cylindrical refraction decreased in 13 eyes and was stable in three eyes.

Mean maximum keratometry value decreased from 49.3 D at baseline to 43.9 D at final follow-up, whereas mean minimum keratometry value decreased from 44.3 D to 41.5 D. Both decreases were considered statistically significant (P < .001).

Corneal thickness changed insignificantly between baseline and final follow-up, according to the researchers.

Disclosure: The authors have no relevant financial disclosures.