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Evaluation of anterior segment parameters using a dual Scheimpflug analyzer in keratoconus patients implanted with intrastromal corneal ring segments

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Session Details

Session Title: Cornea - Surgical III

Session Date/Time: Sunday 06/09/2015 | 14:15-16:15

Paper Time: 15:25

Venue: Room 16

First Author: : L.Torquetti BRAZIL

Co Author(s): :    A. Signorelli   C. Arce   B. Signorelli   P. Ferrara   G. Ferrara   J. Merayo-Lloves     

Abstract Details


To evaluate corneal parameters measured with a dual Scheimpflug analyzer in keratoconus patients implanted with intrastromal corneal ring segments (ICRS).


Centro de Excelência em Oftalmologia, Pará de Minas, Brazil Centro Campineiro de Microcirurgia, Campinas Brazil Clinica Arce, Campinas, Brazil


Fifty eyes of 40 keratoconus patients had Ferrara ICRS implantation from November 2010 to April 2014. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, keratometry (K), asphericity (Q), elevation, pachymetry, root mean square (RMS), spherical aberration and coma were studied. All patients were evaluated using a Dual Scheimpflug system (Ziemer Ophthalmic Systems AG, Port, Switzerland).


The mean follow-up time after the procedure was 12.7 months. The mean UCVA improved from 0.14 to 0.54 (p < 0.001); the mean BCVA improved from 0.46 to 0.91 (p < 0.0001), the mean spherical refraction changed from – 3.06 ± 3.80 D to - 0.80 ± 2.5 D (p < 0.0001) and the mean refraction astigmatism reduced from – 4.51 ± 2.08 D to – 2.26 ± 1.18 D (p < 0.0001). The changes from preoperative to postoperative, in parameters of the anterior and posterior surface of the cornea, were statistically significant except the elevation posterior at the apex of the cornea and posterior asphericity.


The implantation of Ferrara ICRS induces changes in both anterior and posterior surfaces of the cornea.

Financial Interest:

One of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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