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Astigmatic change as a significant prognostic factor of intracorneal ring segments extrusion

Poster Details

First Author: F.D'Oria SPAIN

Co Author(s):    A. Martinez A.   A. Abdelghany   L. Izquierdo Jr   P. Larco Jr   J. Alio        

Abstract Details


To investigate the presence of prognostic factors that can predict the risk of late extrusion of intracorneal ring segments (ICRS) that have been implanted in keratoconic corneas.


Vissum Innovation, Alicante, Spain.


Retrospective, multicenter, series of cases of keratoconic corneas that showed a late natural extrusion of the ICRS after > 2 implantation years and have been eventually explanted. Clinical measures of best corrected distance visual acuity, uncorrected distance visual acuity, manifest refraction, keratometry values, pachymetry and high order aberrations have been recorded and analyzed.


This study included 23 eyes of 23 patients. The mean patient age at the time of ICRS extrusion was 31±9 years (range 17 to 48). The mean interval between the initial surgery and the ICRS extrusion was 5±4 years (range 2 to 17). 68.75% of eyes had adjunctive corneal crosslinking CXL. We found a significant worsened in refractive cylinder between post-ICRS placement evaluation and pre-ICRS extrusion evaluation (2.54±3.40 D and 3.96±1.72 D, respectively; p=0.005).


In the current study, we showed a significant astigmatic change in patients implanted with ICRS prior to late extrusion of the segment, suggesting the role of this parameter as a prognostic factor of extrusion.

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