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Proceedings Article

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

[+] Author Affiliations
Amilcar Estrada-Molina, Rufino Díaz-Uribe

Univ. Nacional Autónoma de México (Mexico)

Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80119J (November 02, 2011); doi:10.1117/12.903417
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From Conference Volume 8011

  • 22nd Congress of the International Commission for Optics: Light for the Development of the World
  • Ramón Rodríguez-Vera; Rufino Díaz-Uribe
  • Puebla, Mexico | August 15, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Topics

Cornea ; Calibration
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 (November 02, 2011); doi:10.1117/12.903417; http://dx.doi.org/10.1117/12.903417


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