Distribution of curvature of 3D nonrotational surfaces approximating the corneal topography

Henryk T. Kasprzak

doi:10.1117/12.328307

22 October 1998 Distribution of curvature of 3D nonrotational surfaces approximating the corneal topography

Henryk T. Kasprzak

Proceedings Volume 3579, Ophthalmic Measurements and Optometry; (1998) https://doi.org/10.1117/12.328307
Event: Ophthalmic Measurements and Optometry, 1997, Kazimierz Dolny, Poland

Abstract

The first part of the paper presents the analytical curves used to approximate the corneal profile. Next, some definition of 3D surfaces curvature, like main normal sections, main radii of curvature and their orientations are given. The examples of four nonrotational 3D surfaces such as: ellipsoidal, surface based on hyperbolic cosine function, sphero-cylindrical and toroidal, approximating the corneal topography are proposed. The 3D surface and the contour plots of main radii of curvature and their orientation for four nonrotational approximation of the cornea are shown. Results of calculations are discussed from the point of view of videokeratometric images.

Citation Download Citation

Henryk T. Kasprzak "Distribution of curvature of 3D nonrotational surfaces approximating the corneal topography", Proc. SPIE 3579, Ophthalmic Measurements and Optometry, (22 October 1998); https://doi.org/10.1117/12.328307

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