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Is it possible to halt the keratoconus progression with intracorneal ring segments in young patients? A 5 year follow-up

Session Details

Session Title: Cornea

Session Date/Time: Sunday 17/02/2013 | 08:30-11:00

Paper Time: 09:23

Venue: Hall 2

First Author: : A.Vega Estrada SPAIN

Co Author(s): :    J. Alio   N. Burguera Gimenez   A. Plaza Puche        

Abstract Details


To analyze if Intracorneal Ring Segment (ICRS) implantations can stop the progression of keratoconus in young (under 30 years old) and keratoconic patients after a long follow-up of 5 years.


Vissum Corporation S. L and the Division of Ophthalmology, University Miguel Hernandez, Alicante, Spain.


A longitudinal restrospective and non randomized analysis of 18 consecutive and evolutive keratoconic eyes of 15 patients, ranging in age from 19 to 30 years (mean age: 25,78 ± 3.59 years) and implanted with ICRS for the management of keratoconus were evaluated. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction, corneal topographic and aberrometric analysis were evaluated preoperatively twice (6 months prior to the surgery and then again just before it) and postoperatively during a period of five years. The differences between the diverse visits of follow-up were calculated in order to analyse the evolution of the disease and the ICRS implantation.


Significantly higher values of cylinder, corneal dioptric power in the flattest meridian (K1), corneal dioptric power in the steepest meridian (K2), and mean corneal power (mean K) were found and confirmed the keratoconus progression before surgery (p ≤ 0.01). The differences induced after 6 months of surgery in cylinder, K1, K2 and mean K were statistically significant (p ≤ 0.01) compared with the evolution changes before surgery. Although there was a long-term improvement in the visual, refractive, topographic and aberrometric data, the difference was not statistically significant when a comparison was made between the induced changes preoperatively and the difference between 6 months and5 years (p > 0.01).


The ICRS provided a significantly short-term improvement in visual, refractive and topographic parameters. Even when we observed that there were no statistical significants changes between 6 months and 5 years, there was a clinical relevant regression that showed that the ICRS may not be able to halt the KC progression.

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