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Purpose <p>To compare the visual, refractive, corneal curvature, and aberrometry outcomes one year following implantation of two intra-stromal corneal rings (ICRS) with different cross-sectional designs.</p> Methods <p>This retrospective longitudinal study included 40 keratoconus eyes implanted with ICRSs with similar characteristics except for their cross-sectional design, Keraring with sharp corners triangular cross-section (n = 20 eyes) and Keratacx Plus with round corners triangular cross-section (n = 20 eyes). The two rings were similar in terms of arc length (355°) and outer diameter (5.7 mm). The uncorrected and corrected distance visual acuity (UDVA &amp; CDVA), refraction, corneal topography, and aberrometry indices were compared before and one year after surgery.</p> Results <p>Despite a significant change in VA, spherical equivalent, astigmatism, and keratometry readings, there was no statistically significant difference in their mean changes between the two rings. (<i>P</i> &gt; 0.05) The mean corneal asphericity expressed by the Q-value showed a statistically significant change toward less prolateness after surgery and was the only parameter with a significant mean change between the two groups (<i>P</i> = 0.04). In comparing the mean changes of corneal aberrometry indices between two rings, a statistically significant difference was seen for total aberration (<i>P</i> = 0.03), lower order aberrations (LOA, <i>P</i> = 0.03), and defocus (<i>P</i> = 0.03). Subgroup analysis based on keratoconus severity (mild and moderate stages) showed a statistically significant difference in Q-value (<i>P</i> = 0.019), total aberration (<i>P</i> = 0.040), LOA (<i>P</i> = 0.041), and defocus (<i>P</i> = 0.027) only for the moderate keratoconus group between the two rings.</p> Conclusions <p>Both rings provided a significant improvement in visual, refractive, and keratometric parameters so that the triangular cross-sectional design of Keratacx Plus with round corners is not superior to Keraring with sharp corners in terms of visual quality and higher order aberrations (HOAs).</p>

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Visual outcomes following implantation of intracorneal rings with sharp and round triangular cross-section designs in keratoconus

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Somaye Soleimani,
  • Shiva Pirhadi,
  • Khosrow Jadidi,
  • Ali Mirzajani,
  • Jamile Abolghasemi,
  • Omid Bagherzadeh,
  • Hamidreza Heidari,
  • Jorge L. Alio,
  • Hamed Momeni-Moghaddam

摘要

Purpose

To compare the visual, refractive, corneal curvature, and aberrometry outcomes one year following implantation of two intra-stromal corneal rings (ICRS) with different cross-sectional designs.

Methods

This retrospective longitudinal study included 40 keratoconus eyes implanted with ICRSs with similar characteristics except for their cross-sectional design, Keraring with sharp corners triangular cross-section (n = 20 eyes) and Keratacx Plus with round corners triangular cross-section (n = 20 eyes). The two rings were similar in terms of arc length (355°) and outer diameter (5.7 mm). The uncorrected and corrected distance visual acuity (UDVA & CDVA), refraction, corneal topography, and aberrometry indices were compared before and one year after surgery.

Results

Despite a significant change in VA, spherical equivalent, astigmatism, and keratometry readings, there was no statistically significant difference in their mean changes between the two rings. (P > 0.05) The mean corneal asphericity expressed by the Q-value showed a statistically significant change toward less prolateness after surgery and was the only parameter with a significant mean change between the two groups (P = 0.04). In comparing the mean changes of corneal aberrometry indices between two rings, a statistically significant difference was seen for total aberration (P = 0.03), lower order aberrations (LOA, P = 0.03), and defocus (P = 0.03). Subgroup analysis based on keratoconus severity (mild and moderate stages) showed a statistically significant difference in Q-value (P = 0.019), total aberration (P = 0.040), LOA (P = 0.041), and defocus (P = 0.027) only for the moderate keratoconus group between the two rings.

Conclusions

Both rings provided a significant improvement in visual, refractive, and keratometric parameters so that the triangular cross-sectional design of Keratacx Plus with round corners is not superior to Keraring with sharp corners in terms of visual quality and higher order aberrations (HOAs).