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Proceedings Paper

Design of a null-screen for a compact corneal topographer
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Paper Abstract

In this work we report the design of a null-screen for corneal topography. Here we assume that the corneal surface is an ellipsoid with a diameter of 12 mm and a radius of curvature of 7.8 mm. To avoid difficulties in the alignment of the test system due to the face contour (eyebrows, nose, or eyelids), we designed a compact conical null-screen with spots drawn in such a way that its image, which is formed by reflection on the test surface, it becomes an exact semi-radial array of circular spots if the surface is perfect. To validate our proposal, we perform topography measurements of a reference surface and some human corneas using a probabilistic algorithm. The results obtained with our algorithm were consistent and we can recover the shape of the surface with accuracy.

Paper Details

Date Published: 21 June 2019
PDF: 10 pages
Proc. SPIE 11057, Modeling Aspects in Optical Metrology VII, 110570I (21 June 2019);
Show Author Affiliations
Manuel Campos-García, Univ. Nacional Autónoma de México (Mexico)
Daniel Aguirre-Aguirre, Univ. Nacional Autónoma de México (Mexico)
José Antonio Lechuga-Núñez, Univ. Nacional Autónoma de México (Mexico)
Andrés Peña-Conzuelo, Univ. Nacional Autónoma de México (Mexico)


Published in SPIE Proceedings Vol. 11057:
Modeling Aspects in Optical Metrology VII
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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