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A corneal model for slit-scanning elevation topography.

G Cairns1, A Collins, C N J McGhee

  • 1Discipline of Ophthalmology, Faculty of Medical and Health Sciences, University of Auckland, New Zealand.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|May 20, 2003
PubMed
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This study models slit-scanning elevation topography, finding refractive index variations minimally impact Orbscan II pachymetry measurements. The developed model accurately represents this corneal topography technology.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Metrology

Background:

  • Computerized videokeratography is advancing in accuracy and sophistication.
  • The Orbscan II Videokeratographer integrates Placido-derived and slit-scanning topography for posterior corneal surface analysis.

Purpose of the Study:

  • To develop a model for slit-scanning elevation topography.
  • To identify potential sources of variation in this measurement methodology.
  • To assess the impact of refractive index shifts on pachymetry measurements.

Main Methods:

  • Ray tracing calculations were performed on a theoretical spherical model to derive pachymetric measurements.
  • The model's pachymetry was compared to Orbscan II measurements of a human eye.
  • A refractive index shift from 1.376 to 1.400 was applied in both methods.

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Main Results:

  • The theoretical model and Orbscan II measurements showed a minimal difference of 0.157 micrometers.
  • This indicates the model is a robust representation of slit-scanning elevation topography.
  • Refractive index variations were found to have a negligible effect on Orbscan II pachymetry.

Conclusions:

  • The constructed model accurately reflects slit-scanning elevation topography.
  • Orbscan II pachymetry measurements are minimally affected by changes in refractive index.
  • This validates the methodology for corneal shape analysis.