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First Author: J.Portelinha PORTUGAL
Co Author(s): M. Picoto M. Patrício A. Almeida F. Isidro T. Ferreira
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To evaluate the clinical outcomes of intracorneal ring segment (ICRS) implantation with or without phakic intra-ocular lens (IOL) implantation in eyes with corneal ectasia.
Egas Moniz Hospital, Lisbon, Portugal
Retrospective study of the patients with corneal ectasia who underwent implantation of intracorneal Ferrara ring between July 2009 and January 2012. Uncorrected distance visual acuity (UDVA), best corrected distance visual acuity (BCVA), keratometry, topographic astigmatism, subjective refraction and pachymetry were evaluated. Complications during and after surgery were assessed.
38 eyes of 31 patients with corneal ectasia were analyzed. Mean age was 30.38 ±6.75 years (range 16.55- 52.53 years). Mean follow-up time was 18.54 ḟ9.27 months (range 2-41 months). After Ferrara ring implantation, mean UDVA improved from 0.11 to 0.44 (p=0.058) and mean BCVA from 0.37 to 0.64 (p<0.001) at the end of the first month (M1). There was progressive reduction of astigmatism and a significant reduction of keratometry values at the end of M1. Pachymetry values did not vary significantly. 3 eyes had spontaneous extrusion of the ring segment (7.3%). 8 patients had phakic IOL implantation for correction of residual refractive error. Mean follow-up time after IOL implantation was 11.48 ±6.41 months (range 2-24.5 months). There was a significant improvement of UDVA from 0.21 to 0.58 (p=0.0277).
Intracorneal ring segments with or without phakic IOL implantation have proved to be effective in improving visual acuity and reducing keratometry and astigmatism values in patients with corneal ectasia.