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Symmetrical intrastromal corneal ring segments benefit eyes with keratoconus
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Eyes with moderate to severe keratoconus experienced a decrease in myopia and astigmatism and an improvement in visual acuity after implantation of a symmetrical intrastromal corneal ring segment, a study found.
The interventional case series analyzed 24 eyes with keratoconus of 22 patients implanted with the Intacs SK (Addition Technology) using a femtosecond laser.
At 1, 3 and 6 months after implantation, mean uncorrected distance visual acuity and corrected distance visual acuity were significantly improved (both P < .001). Uncorrected distance visual acuity was 20/340 preop and 20/70 at 6 months. Corrected was 20/70 preop and 20/40 at 6 months.
In addition, there were significant improvements between preop and 6 months postop in mean astigmatism, mean spherical equivalent refractive error, mean refractive cylinder and mean average total corneal power (all P < .001).
The study was limited by its short follow-up time and not using vector analysis in the calculations, the study authors said.
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