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Experience with progressive thickness intrastromal corneal ring segments for keratoconic eyes

Poster Details

First Author: E.Coskunseven TURKEY

Co Author(s):                        

Abstract Details


To evaluate visual and refractive outcomes in keratoconus patients implanted with Progressive Thickness Intrastromal Corneal Ring Segments (ICRs).


World Eye Hospital Istanbul Turkey


Contact lens-intolerant patients (�â�‰�¥18 years) with advanced asymmetric Bow tie or Oval or Pellucid �â�€�“ like keratoconus (Grade I, II and III) underwent implantation with Progressive Thickness Intrastromal Corneal Ring Segments ( Keraring AS, Mediphacos Ltda, Brazil). All patients underwent refractive assessment and corneal topography preoperatively and postoperatively, including measurement of uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), mean keratometry (Kmean), spherical equivalent (SE) and cylindrical refraction. The mean follow up was 12�Â�±1,0 months.


In this prospective case series, 7 patients (11 eyes) with topographic asymmetric Bow tie , 12 patients (20 eyes) with topographic Oval and 4 patients (8 eyes) Pellucid - like keratoconus were included. The mean age was 22�Â�±2.2 years. There were improvements postoperatively vs. preoperatively in mean UCVA (0.5�Â�±0.2 vs 0.05�Â�±0.01 ), mean BCVA (0.6�Â�±0.14 vs. 0.24�Â�±0.2 ) mean cylindrical refraction (-2.25�Â�±0.2 vs. -5.38�Â�±0.8 D), and mean SE (-2.24�Â�±0.42 vs -7.26�Â�±1.2 D). There was also a reduction in Kmean (45.6 postoperatively vs 53.7 preoperatively).


Implantation of the Progressive Thickness Intrastromal Corneal Ring Segments is an effective and a safe method for the improvement of UCVA and BCVA and corneal topography in advanced asymmetric Bow tie or oval or pellucid �â�€�“ like keratoconic eyes.

Financial Disclosure:

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

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