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Journal of Ophthalmology
Volume 2017, Article ID 5192924, 6 pages
Research Article

Effect of Topically Administered Chitosan-N-acetylcysteine on Corneal Wound Healing in a Rabbit Model

1Center for Medical Physics and Biomedical Engineering, Medical University Vienna, Vienna, Austria
2Christian Doppler Laboratory for Ocular Effects of Thiomers, Vienna, Austria
3Croma Pharma, Korneuburg, Austria
4Singapore Eye Research Institute, Singapore
5Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
6Department of Clinical Pharmacology, Medical University Vienna, Vienna, Austria

Correspondence should be addressed to Gerhard Garhöfer;

Received 27 February 2017; Revised 28 April 2017; Accepted 10 May 2017; Published 12 June 2017

Academic Editor: Taras Ardan

Copyright © 2017 Corinna Fischak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. The present study was performed to investigate the effect of topically administered chitosan-N-acetylcysteine (C-NAC) on corneal wound healing in a rabbit model. Methods. A total of 20 New Zealand White rabbits were included in the randomized, masked, placebo-controlled experiment. A monocular epithelial debridement was induced by manual scraping under general anesthesia. Animals were randomized to receive either C-NAC two times daily or placebo. Monitoring of corneal wound healing was performed with ultra-high-resolution optical coherence tomography (OCT) and epithelial fluorescein staining. Measurements were done immediately after and up to 72 hours after wound induction. Results. No difference in wound size was found immediately after surgical debridement between the C-NAC group and the placebo group. Wound healing was significantly faster in the C-NAC group compared to the placebo group ( for both methods). A good correlation was found between the OCT technique and the epithelial fluorescein staining in terms of wound size (). Conclusions. Administration of C-NAC containing eye drops twice daily leads to a faster corneal wound healing in a rabbit model of corneal debridement as compared to placebo. Ultra-high-resolution OCT is considered a noninvasive, dye-free alternative to conventional fluorescein staining in assessing corneal wound healing also in humans.