Three-dimensional corneal mapping and radius of curvature, a comparison

Bertho A. Th. Stultiens; Franciscus H. M. Jongsma

doi:10.1117/12.200869

1 February 1995 Three-dimensional corneal mapping and radius of curvature: a comparison

Bertho A. Th. Stultiens, Franciscus H. M. Jongsma

Proceedings Volume 2329, Optical and Imaging Techniques in Biomedicine; (1995) https://doi.org/10.1117/12.200869
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

With the use of corneal measuring devices there has been the need to describe the cornea in a simple fashion. The most commonly used method is the radius of curvature whereas the corneal surface is modeled, based on spherical assumptions. Basically two types of radii of curvature are used, axial and instantaneous. Both have their own advantages and drawbacks. Another method of corneal description is to use true topographical shape. From this topography, parameters are calculated using shape-matching in the form of best-fit sphere, B- spline approximation, or other general 3D approximation functions. Accuracy depends highly on the number of points used in matching and the degree of match-function. Using 3D approximation in a clinical environment is only possible if one knows what a normal cornea looks like. Since this is not known exactly, it is impossible to specify the correct matching- function at present. To proof clinical relevance in any measurement, results in 3D mapping have to be developed starting with thorough research in what does the cornea look like and what abnormalities do we want to detect for clinical use.

Citation Download Citation

Bertho A. Th. Stultiens and Franciscus H. M. Jongsma "Three-dimensional corneal mapping and radius of curvature: a comparison", Proc. SPIE 2329, Optical and Imaging Techniques in Biomedicine, (1 February 1995); https://doi.org/10.1117/12.200869

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