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Keratoconus evaluation using the Orbscan Topography System.

G U Auffarth1, L Wang, H E Völcker

  • 1Department of Ophthalmology, Ruprecht-Karls-University of Heidelberg, Germany.

Journal of Cataract and Refractive Surgery
|February 23, 2000
PubMed
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Orbscan topography accurately maps keratoconus morphology, revealing subtle changes and aiding contact lens fitting and surgical management for this corneal condition.

Area of Science:

  • Ophthalmology
  • Corneal Imaging
  • Refractive Surgery

Background:

  • Keratoconus is a progressive corneal ectasia characterized by thinning and irregular astigmatism.
  • Accurate topographic assessment is crucial for diagnosis, management, and monitoring of keratoconus progression.

Purpose of the Study:

  • To evaluate the utility of the Orbscan Topography System in characterizing corneal topography in patients with keratoconus.
  • To analyze quantitative topographic parameters and assess symmetry in keratoconus patients.

Main Methods:

  • Seventy-one eyes of 38 keratoconus patients were analyzed using the Orbscan system.
  • Quantitative parameters including location, elevation, pachymetry, and curvature were assessed at the corneal apex and thinnest point.
  • Mirror-image symmetry between fellow eyes was investigated.

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Main Results:

  • The Orbscan system provided detailed topographic data, including apex and thinnest point measurements.
  • Significant correlations were found between apex elevation and curvature parameters (P < .001).
  • Corneal apex and thinnest point semi-meridians showed correlation in both eyes (P < .05).

Conclusions:

  • The Orbscan system effectively defines keratoconus morphology and detects early topographic changes.
  • This technology can enhance contact lens fitting and surgical planning for keratoconus patients.