Comparison of Femtosecond Laser-assisted Implantation of 325-degree Versus 340-degree Arc Length Intracorneal Ring Segments in Naïve Keratoconic Eyes

Marjan Mazouchi1 , Amir Faramarzi1 *, Kiana Hassanpour1 , Hamed Esfandiari10 , Mohammad-Mehdi Sadoughi1

  1. Ophthalmic Epidemiological Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Abstract: To evaluate and compare clinical outcomes after femtosecond laser-assisted implantation of 325-degree versus 340-degree arc length intracorneal ring segments (ICRS) in eyes with keratoconus

Methods: Setting: Negah Eye Hospital and Labbafinejad Medical Center, Tehran, Iran Design: Prospective non-randomized interventional case series. Methods: Twenty-three eyes of 21 patients diagnosed with keratoconus underwent femtosecond laser-assisted implantation of two types of intracorneal ring segment (ICRS), including 325-degree ICRS (Group 325) and 340-degree ICRS (Group 340). The primary outcome measure was uncorrected distance visual acuity (UDVA), and the secondary outcome measure included corrected distance visual acuity (CDVA), sphere, cylinder, mean refractive spherical equivalent (MRSE), keratometry, vectorial change in corneal astigmatism, and location of maximum keratometry relative to the corneal apex. The study groups were compared in primary and secondary outcome measures obtained at postoperative months 6 and 12.

Results: Groups 325 and 340 consisted of 10 and 13 eyes, respectively. The two groups were comparable in terms of parameters measured preoperatively. Compared to the baseline values, both study groups exhibited a significant increase in UDVA and CDVA measured at postoperative month 6 (Ps< 0.05) and a significant decrease in the sphere, cylinder, spherical equivalent refraction, and keratometry readings measured at postoperative months 6 and 12 (Ps<0.05). No significant difference was observed between the two groups in terms of visual, refractive, and keratometric outcomes at any time point. No intraoperative or postoperative complications were observed in any study groups.

Conclusion: Both 325-degree ICRS and 340-degree ICRS effectively and equally improved visual, refractive, and keratometric outcomes in keratoconic eyes.





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