Long-term results of MyoRing implantation in keratoconic patients

Farshid Karimi1 *, Mostafa Naderi2 , Seyed Aliasghar Mosavi2

  1. Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran
  2. Department of Ophthalmology, Bina Eye Hospital Research Center, Tehran, Iran

Abstract: A few studies, the long-term effects of MyoRing implantation on corneal features were studied.

Methods: A total of 48 keratoconic eyes of 43 consecutive patients who had undergone MyoRing implantation using the Pocket Maker microkeratome (Dioptex, gmbh, Linz, Austria) and completed 5 years of follow‑ups were included in this retrospective study. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refraction and keratometry (K) readings were measured and assessed preoperation, and 5 years postoperatively. As well, post operation satisfaction was assessed using a validated questionnaire.

Results: Five years postoperatively, there was a significant improvement in UDVA, CDVA, K readings, spherical equivalent (SE), and manifest sphere and cylinder (p<0.001). Mean UDVA was 1.20 log MAR before the surgery and 0.42 after the surgery (p<0.001). Mean CDVA was 0.63 log MAR before the surgery and 0.20 log MAR after the surgery (p<0.001). SE was improved from -6.53 diopters (D) before the surgery to -2.23 D after the surgery (p<0.001). Moreover, the results show that the mean K was reduced by 2.82 D after the surgery (P= 0.001). Overall, 81% of patients were moderately to highly satisfied 5 years after surgery.

Conclusion: MyoRing implantation was found to be a minimally invasive procedure, and is safe and effective for improving visual acuity and refraction in most keratoconus patients.





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