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Corneal ring may be option for correction of low myopia

J Cat Refract Surg. 2010;36(7):1149-1155.

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Intrastromal corneal rings appear to offer long-term, safe and effective correction of myopia in eyes with abnormal topography.

Researchers reviewed data from 39 eyes of 21 patients with abnormal topography that precluded excimer laser surgery who were implanted with an Intacs intrastromal corneal ring segment (Addition Technology) to correct myopia lower than –4.5 D. After implantation, 32 eyes (82.05%) were within ±1 D of emmetropia and 18 eyes (46.15%) were within ±0.5 D.

Seven eyes required corneal ring exchange for a thicker model because of undercorrection. After 4 years of follow-up, all eyes were within ±1 D of emmetropia and 25 eyes (63.6%) were within ±0.5 D.

Also, at the end of 4 years, uncorrected distance visual acuity was 20/40 or better in all eyes and 20/20 or better in four eyes. Over the course of follow-up, seven eyes lost one line of corrected distance visual acuity, but no eyes lost two or more lines.

"This 4-year follow-up study found ICRS implantation to be safe and effective in the correction of low myopia in cases in which excimer laser surgery is contraindicated because of abnormal topography," the study authors wrote.

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