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Functional and anatomical success following intrastromal corneal ring segment implantation

Poster Details

First Author: R.Jones UK

Co Author(s):    R. Littlewood   M. Edwards   M. Raynor              

Abstract Details


To evaluate anatomical and functional success following KeraRings (Mediphacos, Brazil) implanted in a University teaching hospital, over a three year period.


The Royal Hallamshire Hospital, Sheffield, UK


Retrospective review of patient case notes who received KeraRings implantation for corneal ectasia between July 2013 and Nov 2016. 78 patients received KeraRing insertion between these dates; case notes were available for 47 (61.5%) patients, (53 eyes). Uncorrected (UCVA) and best corrected visual acuity (BCVA) were compared pre and post operatively. Steep K (K2) and refraction measurements were recorded pre and post operatively and used as measures of corneal curvature.


53 eyes (23 Right, 30 Left). Mean preoperative UCVA of 0.92 logMAR (�Â�±0.47) improved to logMAR 0.50 (�Â�±0.37) one month post operatively (p = 0.000002). Mean preoperative BCVA of 0.36 logMAR (�Â�±0.36) improved to 0.20 (�Â�±0.24) one month post operatively (p = 0.009443). Mean preoperative positive cylinder was 6.00 D (�Â�±2.52), flattening to 3.13 D (�Â�±2.42) at one month follow up. For myopes, mean spherical equivalent preoperative -3.23 D (�Â�±4.41) and one month post operation was -2.37 D (�Â�±2.35). Mean first post operative K2 was 49.74 D (�Â�±4.53) and mean last K2 was 49.86 D (�Â�±3.71).


There was a statistically significant improvement in both UCVA and BCVA following KeraRing implantation. Degree of irregular astigmatism improved and shows long-term stability, when comparing post operative K2 for one month follow up and final follow up (average 35 months) the K2 readings are similar (p=0.92). This study shows both a functional and anatomical improvement following KeraRing implantation in a patient population with corneal ectasia.

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