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Corneal topography by keratometry.

W A Douthwaite1, W T Evardson

  • 1Department of Optometry, University of Bradford, Bradford, West Yorks, BD7 1DP. W.A.Douthwaite@bradford.ac.uk

The British Journal of Ophthalmology
|July 25, 2000
PubMed
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A telecentric keratometer shows promise for measuring corneal topography, accurately describing the asphericity and curvature of human corneas. This method offers a reliable approach to quantifying corneal shape, aiding in clinical assessments.

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Biomedical Optics

Background:

  • Accurate measurement of corneal topography is crucial for diagnosing and managing various eye conditions.
  • Existing methods for assessing corneal curvature and asphericity have limitations.

Purpose of the Study:

  • To evaluate the efficacy of a telecentric keratometer in characterizing the asphericity and curvature of convex ellipsoidal surfaces and human corneas.
  • To compare the telecentric keratometer's performance against established videokeratoscope and profilometry techniques.

Main Methods:

  • Conventional keratometry and telecentric keratometry were used to measure 22 conicoidal surfaces and 30 human corneas.
  • Measurements were taken with surfaces tilted to obtain data from different regions.

Related Experiment Videos

  • Apical radius and p-value of the horizontal meridian were determined and compared with EyeSys videokeratoscope and Talysurf analyses.

    • Main Results:

    • For artificial surfaces, the telecentric keratometer and videokeratoscope generally yielded higher apical radius and p-values than profilometry.
    • The best agreement was observed between profilometry and the keratometer for these surfaces.
    • For human corneas, significant differences were found in apical radii between the keratometer and videokeratoscope, but p-values showed no significant difference.

    Conclusions:

    • The telecentric keratometer demonstrates potential as a valuable tool for quantifying corneal topography.
    • This method shows promise for accurate assessment of corneal curvature and asphericity in clinical practice.