Characterization of a conical null-screen corneal topographer

Arturo I. Osorio-Infante; Manuel Campos-García; Cesar Cossio-Guerrero

doi:10.1117/12.2270055

26 June 2017 Characterization of a conical null-screen corneal topographer

Arturo I. Osorio-Infante, Manuel Campos-García, Cesar Cossio-Guerrero

Proceedings Volume 10330, Modeling Aspects in Optical Metrology VI; 103301E (2017) https://doi.org/10.1117/12.2270055
Event: SPIE Optical Metrology, 2017, Munich, Germany

Abstract

In this work, we perform the characterization of a conical null-screen corneal topographer. For this, we design a custom null-screens for testing a reference spherical surfaces with a radius of curvature of 7.8 mm. We also test a 1/2-inch (12.7 mm) diameter stainless steel sphere and an aspherical surface with a radius of curvature of 7.77 mm. We designed some different target distributions with the same target size to evaluate the shape of the reference surfaces. The shape of each surface was recovered by fitting the experimental data to a custom shape using the least square methods with an iterative algorithm. The target distributions were modified to improve the accuracy of the measurements. We selected a distribution and evaluate the accuracy of the algorithms to measure spherical surfaces with a radius of curvature from 6 mm to 8.2 mm by simulating the reflected pattern. We also simulate the reflected patter by changing the position of the surface along the optical axis and then we measure the resulting radius of curvature.

Citation Download Citation

Arturo I. Osorio-Infante, Manuel Campos-García, and Cesar Cossio-Guerrero "Characterization of a conical null-screen corneal topographer", Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103301E (26 June 2017); https://doi.org/10.1117/12.2270055

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