Abstract

An algorithm to compute the sagittal and meridional radii of curvature for a surface of revolution is presented. The sagittal radius is obtained from the surface normal, and the meridional radius is calculated from a function fitted to the derivative of the sagittal curvature by using the surface-normals raw data. A calibration spherical surface is tested by using the null-screen testing method. Experimental results of the spherical surface show that the sagittal and meridional radii of curvature differ by 2.600% and 2.604%, respectively, with respect to the actual radius of the calibration spherical surface.

© 2013 Optical Society of America

Evaluating the anterior corneal surface using an improved null-screen system

Manuel Campos-García, Victor de Emanuel Armengol-Cruz, and Arturo Ioan Osorio-Infante
OSA Continuum 2(3) 736-748 (2019)

Surface shape evaluation with a corneal topographer based on a conical null-screen with a novel radial point distribution

Manuel Campos-García, Cesar Cossio-Guerrero, Víctor Iván Moreno-Oliva, and Oliver Huerta-Carranza
Appl. Opt. 54(17) 5411-5419 (2015)

Improving fast aspheric convex surface tests with dynamic null screens using LCDs

Manuel Campos-García, Víctor Iván Moreno-Oliva, Rufino Díaz-Uribe, Fermín Granados-Agustín, and Agustín Santiago-Alvarado
Appl. Opt. 50(19) 3101-3109 (2011)

Testing fast aspheric concave surfaces with a cylindrical null screen

M. Campos-García, R. Bolado-Gómez, and R. Díaz-Uribe
Appl. Opt. 47(6) 849-859 (2008)

Null-screen testing of fast convex aspheric surfaces

Rufino Díaz-Uribe and Manuel Campos-García
Appl. Opt. 39(16) 2670-2677 (2000)