Three-dimensional representations of corneal deformations from keratotopography data

Abstract

Purpose: To improve the perception of corneal shape from the data measured by a corneal topography system.Methods: A computer program to illustrate the deformation of the cornea measured by corneal topography is described. The deviations from a regular corneal curvature are presented in a three-dimensional (3-D) map. Elimination of the basic curvature in the individual cornea allows the small deformations of the cornea to be seen as shapes and not as power maps.Conclusion: The images obtained with the 3-D maps are different from the keratotopographic images. The latter show the deformation of the cornea on a micrometric scale and are understandable in terms of shape or surgical planning. Using our inborn 3-D perception mechanism provides a better understanding of corneal shape. A shape reconstruction from the keratotopographic image alone is nearly impossible.