ArticleScientific reports2026
Outcomes of keraring implantation for high regular astigmatism in non-ectatic corneas: A prospective pilot case series.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study aimed to evaluate the effectiveness of intracorneal ring segments (Keraring) implantation for the management of high regular astigmatism (> 3.00 D) in eyes with non-ectatic corneas. Twenty eyes of twenty patients with high regular astigmatism and topographically normal corneas. All eyes underwent femtosecond laser-assisted implantation of SI-5 Keraring segments. Comprehensive preoperative and postoperative assessments included uncorrected and best-corrected distant visual acuity, manifest refraction, keratometric measurements, and anterior corneal higher-order aberrations (HOAs). Follow-up examinations were performed at 1 week, 1 month, and 6 months. Statistical analysis incorporated repeated-measures ANOVA and Pearson correlation coefficients. Significant improvement in UDVA was observed at all postoperative visits (p < 0.001). CDVA improved significantly during the early postoperative period but not at 6 months. Mean refractive astigmatism decreased markedly from - 8.19 ± 2.50 D preoperatively to - 3.14 ± 1.55 D at 6 months postoperatively, corresponding to a mean reduction of 61.3% (p < 0.000). Significant reductions were also observed in spherical equivalent, Keratometric indices, total HOAs and coma aberrations. Corneal thickness and spherical aberrations showed no significant changes throughout the follow-up period. No intraoperative or postoperative complications were observed. Keraring implantation may provide meaningful improvements in visual acuity, refractive outcomes, corneal regularity, and selected higher-order aberrations in eyes with high regular astigmatism and non-ectatic corneas. Larger studies with longer follow-up are warranted to confirm these preliminary findings.
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