Topographic Pattern-Based Nomogram to Guide Keraring Implantation in Eyes with Mild to Moderate Keratoconus: Visual...

Area of Science:

• Ophthalmology
• Corneal Surgery
• Vision Science

Background:

• Keratoconus is a progressive corneal ectasia causing visual impairment.
• Mild to moderate keratoconus requires effective treatment strategies to improve visual outcomes.
• Keraring implantation is a surgical option for managing keratoconus.

Purpose of the Study:

• To evaluate the efficacy and safety of Keraring implantation using a topographic pattern-based nomogram.
• To assess visual acuity and refractive outcomes after Keraring implantation.
• To analyze changes in corneal topography and aberrations post-surgery.

Main Methods:

• Retrospective analysis of 47 eyes with stage I-II keratoconus undergoing femtosecond laser-assisted Keraring implantation.
• Keraring selection guided by a topographic pattern-based nomogram.
• Preoperative and postoperative data collection including visual acuity, refraction, and Pentacam HR tomographic analysis.

Main Results:

• Significant improvement in uncorrected distance visual acuity (UDVA) by 5.13 lines (p < 0.001).
• Marked enhancement in corrected distance visual acuity (CDVA), with 85.1% of eyes achieving ≥ 20/25.
• Reduction in refractive cylinder, keratometry, and corneal high-order aberrations, including vertical coma (p < 0.001).

Conclusions:

• Topographic pattern-based nomogram-guided Keraring implantation is highly effective and safe for mild to moderate keratoconus.
• The procedure leads to clinically significant improvements in UDVA and CDVA.
• Keraring implantation effectively reduces corneal irregularities and aberrations.