28 September 2016 Corneal topography with conical null-screen for non-symmetric aspheric corneas
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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.
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Victor de Emanuel Armengol-Cruz, Arturo I. Osorio-Infante, Manuel Campos-García, Cesar Cossio-Guerrero, José Rufino Díaz-Uribe, "Corneal topography with conical null-screen for non-symmetric aspheric corneas", Proc. SPIE 9947, Current Developments in Lens Design and Optical Engineering XVII, 994714 (28 September 2016); doi: 10.1117/12.2237372; https://doi.org/10.1117/12.2237372
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