gms | German Medical Science

102. Jahrestagung der DOG

Deutsche Ophthalmologische Gesellschaft e. V.

23. bis 26.09.2004, Berlin

Early detection of keratokonus using the Orbscan Corneal Topography System

Meeting Abstract

  • corresponding author A. J. Reuland - Heidelberg IOL & Refractive Surgery Research Group, Universitäts-Augenklinik, Heidelberg
  • K. A. Becker - Heidelberg IOL & Refractive Surgery Research Group, Universitäts-Augenklinik, Heidelberg
  • M. P. Holzer - Heidelberg IOL & Refractive Surgery Research Group, Universitäts-Augenklinik, Heidelberg
  • T. M. Rabsilber - Heidelberg IOL & Refractive Surgery Research Group, Universitäts-Augenklinik, Heidelberg
  • G. U. Auffarth - Heidelberg IOL & Refractive Surgery Research Group, Universitäts-Augenklinik, Heidelberg

Evidenzbasierte Medizin - Anspruch und Wirklichkeit. 102. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft. Berlin, 23.-26.09.2004. Düsseldorf, Köln: German Medical Science; 2004. Doc04dogP 035

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/dog2004/04dog526.shtml

Published: September 22, 2004

© 2004 Reuland et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.


Outline

Text

Objective

To establish and test diagnostic criteria for early detection of keratokonus. Detection of keratokonus is important prior to refractive surgery.

Methods

This retrospective review comprised 116 eyes of 58 patients who were diagnosed with keratokonus in at least one eye. ORBSCAN II (Bausch & Lomb) corneal topography was evaluated for all 116 eyes. Keratokonus forme fruste was defined as eyes with a stable refraction and an unchanged visual acuity. For comparison we evaluated Orbscan corneal topography of 40 eyes of 20 healthy volunteers prospectively. We evaluated anterior and posterior elevation difference, the difference in keratometric power and the max. keratometric power within the central 7mm in all eyes.

Results

We found 18 keratokoni forme fruste within the keratokonus patients. Posterior difference in elevation within the central 7mm was found to be the best of all evaluated diagnostic criteria. 15 of 18 eyes with keratokonus forme fruste had a difference in elevation of ≥80mm. 35 of 40 healthy eyes had a difference in elevation of <80mm. This diagnostic criterium has a sensitivity of 83% and a specifity of 88%.

Conclusions

Early stages of keratokonus can be detected with good sensitivity and specifity using the Orbscan system.