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A new 355 degree intracorneal ring segment for management of keratoconus, one year follow-up

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Session Details

Session Title: Refractive Corneal Surgery

Session Date/Time: Wednesday 17/09/2014 | 08:00-09:30

Paper Time: 09:13

Venue: Boulevard A

First Author: : T.A. Wahab EGYPT

Co Author(s): :                  

Abstract Details


To assess the visual, refractive and corneal aberrometric outcomes after the implantation of 355 D Intra-corneal Ring Segment (ICRS) in keratoconus cases , one year follow up .


Clear Vision Center , cairo, Egypt


Fifty eyes of 37 patients suffering from Keratoconus have been treated by a 355 ICRS. Corneal tunnels of 6 mm in diameter at 70% corneal depth have been created using Intralase Femtosecond laser,. Sixteen patients were male and 4 were female. The age of the patients ranged from 20 years to 42 years (mean 26 years). Eight eyes suffered from mild (average central K-reading (ACK) < 48 diopters (D)), nine eyes from moderate (48 D < ACK < 52 D) and eight eyes from advanced (ACK > 52 D) Keratoconus. Main criteria for success was patient satisfaction and uncorrected distance visual acuity (UDVA). A further decision criterion for the postoperative enhancement strategy was a particular topographic pattern criterion in the postoperative tangential map. Postoperative 1 year follow-up


After initial implantation the average improvement in UDVA was 8.4 lines. Three eyes out of the 25 eyes treated (12%) received a postoperative optimization procedure either by exchanging the implant for one with another thickness or by removal & reimplantation 2 months later. After optimization the average improvement in UDVA in the entire group (25 eyes) was 10.5 lines. No intraoperative complications were seen.


The presented 355 Degree ICRS has refractive myopic correction through corneal re-modeling, may reduce vertical coma Z (3, -1), and RMS value of HOAs aberrations in eyes with central keratoconus, providing an improvement of UDVA and CDVA values.

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