Nine-Year Follow-Up of Intacs Implantation for Keratoconus

George D Kymionis, Michael A Grentzelos, Vasilios F Diakonis*, Aristofanis I Pallikaris, Ioannis G Pallikaris
Institute of Vision and Optics, Department of Ophthalmology, Medical School, University of Crete, Greece

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© Kymionis et al.; Licensee Bentham Open.

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* Address correspondence to this author at the Institute of Vision & Optics, Department of Medicine, University of Crete, 71003 Heraklion, Crete, Greece; Tel: ++302810.371800; Fax: ++302810.394653; E-mail:



To present a case of nine- year bilateral Intacs (Addition Technology, Inc, Fremont, California, USA) implantation for early stage keratoconus.


A 25-year-old male underwent bilateral Intacs implantation for the management of keratoconus and hardcontact-lens intolerance (stage 1) in 1999.


Nine years postoperatively, spherical equivalent refraction changed from preoperative -0.75 and -2.25 to +0.75 and –1.25 for the right and the left eye, respectively. UCVA was improved from 20/50 to 20/25 in the right and from 20/200 to 20/32 in the left eye. BSCVA of 20/20 in the right eye maintained stable in comparison with the Pre-Intacs BSCVA, while BSCVA was improved from 20/25 to 20/20 in the fellow eye. No early or late complications were observed.


Nine years after bilateral Intacs implantation for the management of early stage keratoconus, there was a significant improvement and postoperative stability in patient’s visual acuity. No long-term, sight-threatening complications were identified during follow-up.