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Intrastromal corneal ring segment Implantation (Kera Ring355º) in patients with pellucid marginal corneal degeneration: 6-12 months follow-up data

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Session Details

Session Title: Combined Cataract Surgery Techniques. Surgical Devices

Session Date/Time: Saturday 05/09/2015 | 08:30-10:30

Paper Time: 10:10

Venue: Main Auditorium

First Author: : F.Nejat IRAN

Co Author(s): :    K. Jadidi   S. Mosavi   L. Janani              

Abstract Details


To report the outcomes after the implantation of Keraring 355º intrastromal corneal ring (ICR; Mediphacos, Belo Horizonte, Brazil) aided by PocketMaker microkeratome(DIOPTEX GmbH, Austria )for the treatment of pellucid marginal degeneration.


Department of Ophthalmology, Bina Eye Hospital Research center, Tehran, Iran


This study included 11 eyes of 11 patients (mean age, 35 ± 8.65 years) with pellucid marginal degeneration who underwent ICR implantation (Keraring355°) using mechanical dissection with the PocketMaker microkeratome. The main outcomes measures included: Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction and keratometry readings. The mean postoperative follow-up was 10 months (range 6-12 months).


At the 6-12 month follow-up visit, there was a statistically significant reduction in the mean spherical equivalent refractive error (-0.52 ± 1.53 D postoperative versus -3.46± 1.36 D preoperative, p=0.001).The mean UDVA (logMAR) improved from 0.85± 0.25 preoperatively to 0.25± 0.15 postoperatively (p=0.001), while mean CDVA (logMAR) improved from 0.45 ± 0.13 to 0.18± 0.13, p=0.001). The mean sphere and cylinder of manifest refraction decreased significantly by 2 and 2.5.00 diopter (D) respectively (p< 0.001).Additionally, the mean K reading decreased by 5.75 D (from 47.29 D to 41.54 D, p=0.001). The majority of patients were satisfied with Keraring 355º implant. No intraoperative and postoperative complications were demonstrated in this series of patients.


The outcomes of this study show that the ICRS (KeraRing 355º) implantation using PocketMaker microkeratome appears to provide an effective method for treating pellucid marginal degeneration.

Financial Interest:


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