Tangential and sagittal curvature from the normals computed by the null screen method in corneal topography

Amilcar Estrada-Molina; Rufino Díaz-Uribe

doi:10.1117/12.903417

2 November 2011 Tangential and sagittal curvature from the normals computed by the null screen method in corneal topography

Amilcar Estrada-Molina, Rufino Díaz-Uribe

Author Affiliations +

Proceedings Volume 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World; 80119J (2011) https://doi.org/10.1117/12.903417
Event: International Commission for Optics (ICO 22), 2011, Puebla, Mexico

Abstract

A new method for computing the tangential and sagittal curvatures from the normals to a cornea is proposed. The normals are obtained through a Null Screen method from the coordinates of the drops shaped spots at the null screen, the coordinates on a reference approximating surface and the centroids on the image plane. This method assumes that the cornea has rotational symmetry and our derivations will be carried out in the meridional plane that contains the symmetry axis. Experimental results are shown for a calibration spherical surface, using cylindrical null screens with radial point arrays.

Citation Download Citation

Amilcar Estrada-Molina and Rufino Díaz-Uribe "Tangential and sagittal curvature from the normals computed by the null screen method in corneal topography", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80119J (2 November 2011); https://doi.org/10.1117/12.903417

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