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Intrastromal ring segments improve distance visual acuity up to 10 years
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Intrastromal ring segments yielded long-term improvement in distance visual acuity in eyes with keratoconus, according to a study.
The retrospective study included 36 eyes that had keratoconus and received Ferrara intrastromal ring segments (AJL Ophthalmic).
Investigators evaluated logMAR uncorrected and corrected distance visual acuity, keratometry and central corneal thickness at 5 years and 10 years after surgery.
Mean uncorrected distance visual acuity improved from 1.01 preoperatively to 0.71 at 5 years and 0.67 at 10 years. The improvement from baseline to 5 years was statistically significant (P < .05).
Mean corrected distance visual acuity improved from 0.45 preoperatively to 0.24 at 5 years and 0.29 at 10 years. The gain from baseline to 5 years was significant (P < .05).
Mean maximum keratometry value decreased from 54.99 D at baseline to 50.58 D at 5 years and 50.65 D at 10 years; the decrease from baseline to 5 years was significant (P < .05).
Central corneal thickness decreased from 457.42 µm to 421.34 µm at 5 years and 434.52 µm at 10 years; the decrease from baseline to 5 years was statistically significant (P = .039).
Disclosure: P. Ferrara, G. Ferrara and Merayo-Lloves have a financial interest in the Ferrara intrastromal corneal ring. The remaining authors have no relevant financial disclosures.
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