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Contact lenses fitting after intracorneal ring segments (ICRS) implantation

Poster Details

First Author: A.Abreu PORTUGAL

Co Author(s):    J. Coelho   V. Lages   M. Furtado   I. Barbosa     

Abstract Details


To evaluate contact lens fitting after ICRS implantation and to evaluate the usefulness of Pentacam’s contact lens fitting software in these situations.


Department of Ophthalmology of a Tertiary Referral Centre in Oporto, Portugal - Centro Hospitalar do Porto


Retrospective, non-randomized study, of the clinical records of patients submitted to ICRS implantation who underwent contact lenses fitting between January 2009 and January 2015, at our Ophthalmology Department. This study only includes those patients we examined with Oculus Pentacam® HR before contact lens fitting. We evaluated the demographic data, pre and post contact lenses fitting BCVA, number of trials performed, follow-up time, the patients’ comfort and ability to use contact lenses, the relation between keratometry readings measured by Pentacam, parameters of the suggested contact lens, and parameters of fitted contact lens.


22 eyes were included in this study. On average, 5 trials were performed for contact lenses fitting. Soft contact lenses were adapted in 4 cases, rigid gas permeable contact lenses in 8, hybrid contact lenses in 9 and one case in which trial contact lenses were not tolerate. Prior to adjustment, average BCVA was 20/60 and it improved to 20/35 after contact lenses fitting (p<0.01). Keratometry readings measured by Pentacam were well correlated with the suggested base curves for contact lenses fitting. However, base curves of prescribed contact lenses were not strongly correlated with those suggested by this exam.


Contact lenses fitting after ICRS implantation is possible, however, it can be difficult. When successful, the use of contact lenses can improve patients’ visual acuity, and may allow the postponement of corneal transplant. Pentacam is an important exam to measure keratometry, being sometimes the only method of measurement in irregular corneas. It gives important guidance for the selection of the first contact lens to be tested. However, the suggested contact lens in these situations has shown hardly useful because, besides being based on a limited data bank, is also based on static and not dynamic evaluation of the ocular surface. FINANCIAL DISCLOUSRE: NONE

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