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Proceedings Paper

Corneal topography with conical null-screen for non-symmetric aspheric corneas
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Paper Abstract

In this work, we will present some improvements to the conical null-screen based corneal topographer, for testing aspheric surfaces without rotational symmetry. We present the formulae to design the conical null-screen in such a way that the image on the CCD is a perfect array of spots; departures from this geometry are due to deformation or misalignment of the surface. Additionally, we will explain how to improve the algorithms to find the normals of corneal surface. Finally, we will evaluate the topography of a spherical surface.

Paper Details

Date Published: 28 September 2016
PDF: 8 pages
Proc. SPIE 9947, Current Developments in Lens Design and Optical Engineering XVII, 994714 (28 September 2016); doi: 10.1117/12.2237372
Show Author Affiliations
Victor de Emanuel Armengol-Cruz, Univ. Nacional Autónoma de México (Mexico)
Arturo I. Osorio-Infante, Univ. Nacional Autónoma de México (Mexico)
Manuel Campos-García, Univ. Nacional Autónoma de México (Mexico)
Cesar Cossio-Guerrero, Univ. Nacional Autónoma de México (Mexico)
José Rufino Díaz-Uribe, Univ. Nacional Autónoma de México (Mexico)


Published in SPIE Proceedings Vol. 9947:
Current Developments in Lens Design and Optical Engineering XVII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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