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BioMed Research International
Volume 2013 (2013), Article ID 848363, 6 pages
Clinical Study

Intraoperative Pachymetry Using Spectral-Domain Optical Coherence Tomography during Accelerated Corneal Collagen Crosslinking

1Hong Kong Eye Hospital, Hong Kong
2Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong
3Department of Ophthalmology, Prince of Wales Hospital, Shatin, Hong Kong
4Centre for Eye Research Australia, University of Melbourne, Melbourne, VIC 3002, Australia

Received 29 April 2013; Accepted 17 June 2013

Academic Editor: Vasilios F. Diakonis

Copyright © 2013 Vanissa W. S. Chow 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. To evaluate the role of spectral-domain optical coherence tomography (SDOCT) to measure corneal thickness during accelerated corneal crosslinking (CXL). Methods. Intraoperative pachymetry was performed using SDOCT and ultrasound pachymetry (USP) in 6 eyes of 6 patients with keratoconus. Pachymetry readings were obtained at baseline, after epithelium removal and after 30 minutes of riboflavin instillation. SDOCT measurements of eyes with and without lid speculum during riboflavin instillation were compared. Results. There was no statistically significant difference in central corneal thickness (CCT) measurements between SDOCT and USP ( for all). A significant decrease in both CCT ( ) and the thinnest corneal thickness (TCT) ( ) was observed during CXL. There was a greater reduction in CCT (38 ± 6%) with the use of lid speculum as compared to the no-speculum eyes (18 ± 9%) ( ). TCT was also reduced by a greater extent with the use of lid speculum (40 ± 5% versus 26 ± 7%; ). Conclusion. SDOCT can be successfully used to measure intraoperative corneal pachymetry during corneal CXL. SDOCT measurements demonstrated corneal thinning intraoperatively during CXL, which was further accentuated by the use of a lid speculum during the procedure.