SAHAR MOJALED NOBARI1, CONSUELO VILLENA1, KHOSROW JADIDI2
PhD candidate of Optometry, Master in Optometry and Vision, Department of Optics II (Optometry and Vision), Complutense University, Madrid, Spain -
Consuelo Villena: PhD, Professor of Optometry, Department of Optics II (Optometry and Vision), Complutense University, Madrid, Spain - MD, Ophthalmologist, Associate Professor of Ophthalmology, Bina Eye Hospital Research Center, Between Sayyad-e Shiraz and Imam Ali Highways, Resalat Highway, Tehran, Iran
Purpose: To compare combined MyoRing implantation with previously corneal collagen cross-linking (CXL- MyoRing) versus
MyoRing implantation alone in patients with keratoconus.
Methods: This retrospective, comparative, cohort study included 33 eyes of 33 patients with keratoconus stage II and III
according to Amsler-Krumeich classification. Two groups were performed for this study with 1 year follow up. The group 1 received
MyoRing implantation and the group 2 received CXL approximately 12 months before MyoRing implantation. All patients had a complete
pre and post-operative examination including visual, refractive and keratometry examinations.
Results: In Group 1 at the end of follow up the mean UDVA and CDVA improved by 9 and 4 lines of logMAR. In Group 2 the
mean UDVA and CDVA improved by 8 and 2 lines of logMAR. There was not observed a statistically significant difference between
mean UDVA of two groups postoperatively (p = 0.142) whereas the mean CDVA in Group 2 was significantly better than mean
Group 1 at the end of follow up (p= 0.018). Spherical equivalent error and refractive astigmatism were significantly reduced in both
groups which no statistically significant differences was noted in these refractive parameters between two groups. The mean keratometric
values also were reduced in both groups at the end of follow up which no statistically significant difference was observed
between two groups.
Conclusion: Both MyoRing implantation alone and combined MyoRing implantation with previously CXL were safe and effective
methods for moderate and severe keratoconus and resulted in similar clinical outcomes after one year follow up.
ExclusivelyMyoRing implantation alone demonstrated better outcome in mean CDVA.
Corneal Collagen Cross-linking, MyoRing, Keratoconus, Intracorneal Ring Segment implantation.