Single and paired intrastromal corneal ring segments combined with corneal cross-linking improved visual acuity and reduced astigmatism in eyes with keratconus, according to a study.
Investigators retrospectively evaluated 85 eyes of 74 patients with keratoconus. Paired Intacs intracorneal ring segments (Addition Technology) were implanted in 47 eyes of 40 patients; single segments were implanted in 38 eyes of 34 patients.
An Intralase femtosecond laser (Abbott Medical Optics) was used to create ring channels. Cross-linking was performed on the same day, after ring segment implantation. Choice of single or paired segments was based on corneal topography.
Uncorrected distance visual acuity improved 3.4 lines with a single ring and 2.7 lines with paired rings; both gains were statistically significant (P = .04 and P = .01, respectively). No patients lost lines of corrected distance visual acuity.
Mean cylinder was reduced from −3.84 D to −2.19 in the single ring group and −3.91 D to −2.96 D in the paired ring group; both reductions were statistically significant (both P = .02). Higher-order aberrations were similar in both groups, according to the authors.
Disclosure: The study authors report no relevant financial disclosures.