Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


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Intrastromal corneal ring segments (210 degree arc length) in central hyperprolate keratoconus

Poster Details

First Author: L. Fernandez-Vega Cueto SPAIN

Co Author(s):    C. Lisa   J. Merayo-Lloves   D. Madrid-Costa   J. Alfonso           

Abstract Details


To assess the efficacy outcomes (visual, refractive and in terms of corneal aberrometry) of implanting intrastromal corneal ring segments (ICRS) to correct central keratoconus.


Instituto Universitario Fernández-Vega (Oviedo). Spain.


Forty-one eyes with central keratoconus were evaluated before and after implanting inferior 210 degree arc length Ferrara-type AFR5 ICRS (AJL Ophtalmic, Spain). LogMAR uncorrected (UDVA) and best corrected (CDVA) distance visual acuity, corneal spherical aberration (Z(4,0)), horizontal coma (Z(3,1)), vertical coma (Z(3,-1)), root mean square (RMS) of higher-order aberrations (HOAs) and residual refractive errors analysed using vector analysis were recorded before and 6 months after ICRS implantation.


The mean UDVA (LogMAR scale) rose from 0.87 ± 0.33 before to 0.52 ± 0.29 after ICRS implantation (P< 0.0001). The mean pre-operative CDVA was 0.31 ± 0.28 and the post-operative value 0.16 ± 0.11 (P=0.0004). The CDVA remained unchanged or improved in all eyes after surgery. The safety index was 1.32. The spherical equivalent declined steeply after ICRS implantation (P< 0.0001). The RMS values for HOAs and Zernike coefficients Z(4,0) and Z(3,-1) exhibited statistically significant decreases 6 months after ICRS implantation (P=0.004, 0.03 and 0.0002, for the RMS of HOAs, Z(4,0) and Z(3,-1), respectively).


A single, inferior, 210 degree arc length Ferrara-type AFR5 ICRS may lower the spherical equivalent, RMS of HOAs and Zernike coefficients Z(4,0) and Z(3,-1) in central keratoconic eyes, with a concomitant improvement in post-surgery UDVA and CDVA values.

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