International Journal of Keratoconus and Ectatic Corneal Diseases

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VOLUME 2 , ISSUE 2 ( May-August, 2013 ) > List of Articles


Preliminary Results of Femtosecond Laser Assisted Corneal Ring Segment Implantation for Keratoconus

Vardhaman P Kankariya, Kemal Ozulken, Florence Cabot, Sonia H Yoo

Citation Information : Kankariya VP, Ozulken K, Cabot F, Yoo SH. Preliminary Results of Femtosecond Laser Assisted Corneal Ring Segment Implantation for Keratoconus. Int J Kerat Ect Cor Dis 2013; 2 (2):47-50.

DOI: 10.5005/jp-journals-10025-1049

Published Online: 01-04-2016

Copyright Statement:  Copyright © 2013; The Author(s).



To present refractive, visual and topographic outcomes of femtosecond laser assisted intrastromal ring segments (ISRS) implantation.


Bascom Palmer Eye Institute, Miami, FL, USA.

Materials and methods

Nineteen eyes of 15 patients with keratoconus, clear central corneas, and contact lens intolerance had implantation of a symmetrical 0.45 mm Inta cs segment (Addition Technology Inc, California, USA) using 200 kHz femtosecond laser (WaveLight GmbH, Erlangen, Germany). The outcomes of the procedure were evaluated in terms of uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), average keratometry value (K-value) and spheric equivalent (SE).


Femtosecond laser assisted ISRS implantation could be performed with ease, while no intra- or postoperative complications were encountered. Mean UCVA improved from 0.95 ± 0.39 to 0.66 ± 0.28 logMAR, mean BSCVA improved from 0.46 ± 0.13 to 0.29 ± 0.21 logMAR, mean spherical equivalent considerably reduced from −7.15 ± 4.57 to −4.38 ± 4.07 and K value reduced from 52.39 ± 5.79 to 49.78 ± 6.84 D at the last follow-up.


Using a 200 kHz femtosecond laser is a safe procedure providing optimal refractive, visual and topographic outcomes in our preliminary study.

How to cite this article

Ozulken K, Cabot F, Kankariya VP, Yoo SH. Preliminary Results of Femtosecond Laser Assisted Corneal Ring Segment Implantation for Keratoconus. Int J Kerat Ect Cor Dis 2013;2(2):47-50.

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