Abstract
Purpose
To evaluate the effect of complete intrastromal corneal ring implantations on patients with pellucid marginal degeneration (PMD).
Design
Prospective interventional case series
Patients and Methods
Thirty-three eyes with PMD were included into the study. After pocket creation with femtosecond laser (Femtec; 20/10 PerfectVision), MyoRing implantation was performed. Uncorrected and corrected distance visual acuity (UDVA, CDVA), subjective refraction, keratometry, central corneal thickness, corneal biomechanical profile (Ocular Response Analysis), and whole-eye wavefront aberrometry (iTrace) were evaluated preoperatively and also postoperatively, 1 month, 3 months, 6 months, and 1 year after the operation.
Results
One month after surgery, significant improvements were observed in UDVA (ANOVA; P=0.02), mean keratometry, sphere (ANOVA; P <0.001), and cylinder (ANOVA; P=0.04) with no significant changes afterwards. No significant change occurred in the corneal biomechanical profile. Primary coma and trefoil reduced after 1 year (ANOVA; P values were 0.02 and 0.06, respectively). Primary spherical aberration significantly increased according to the 1-year follow-up (ANOVA; P<0.001). No significant complication was observed.
Conclusion
MyoRing is considered as a treatment modality for spherocylindrical correction in patients with PMD, with an acceptable safety and efficacy profile.
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Jabbarvand, M., Hashemian, H., Khodaparast, M. et al. Outcome of complete intrastromal ring implantation using femtosecond laser in pellucid marginal degeneration. Eye 29, 783–790 (2015). https://doi.org/10.1038/eye.2015.33
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DOI: https://doi.org/10.1038/eye.2015.33
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