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Journal of Ophthalmology
Volume 2012, Article ID 587075, 4 pages
Case Report

Bilateral Circumscribed Posterior Keratoconus: Visualization by Ultrasound Biomicroscopy and Slit-Scanning Topography Analysis

1Department of Ophthalmology, Medical University of Lublin, 20-059 Lublin, Poland
2Department of Ophthalmology, University of Erlangen-Nürnberg, 91054 Erlangen, Germany

Received 21 February 2011; Accepted 20 November 2011

Academic Editor: Ioannis M. Aslanides

Copyright © 2012 Robert Rejdak 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.


This paper documents a rare nonprogressive developmental disorder—bilateral circumscribed posterior keratoconus—in a 60-year-old man referred for a cataract surgery. For the first time ultrasound biomicroscopy was used to visualise the local anterior bulging of the posterior corneal surface with concomitant thinning of the stroma. The amount of localized posterior depression, corneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning topography analysis (Orbscan).