Conical null-screen design for evaluating a biconical surface using a smartphone-based corneal topographer

Manuel Campos-García; Oliver Huerta-Carranza; Luis Ángel Pantoja-Arredondo; Ángel Sinue Cruz-Félix; Agustin Santiago-Alvarado; Daniel Aguirre-Aguirre; Víctor Iván Moreno-Oliva; Christian Camargo-Fierro

doi:10.1117/12.2633701

3 October 2022 Conical null-screen design for evaluating a biconical surface using a smartphone-based corneal topographer

Manuel Campos-García, Oliver Huerta-Carranza, Luis Ángel Pantoja-Arredondo, Ángel Sinue Cruz-Félix, Agustin Santiago-Alvarado, Daniel Aguirre-Aguirre, Víctor Iván Moreno-Oliva, Christian Camargo-Fierro

Author Affiliations +

Proceedings Volume 12221, Optical Manufacturing and Testing XIV; 122210L (2022) https://doi.org/10.1117/12.2633701
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

We propose the design of a conical null-screen with quasi-elliptical targets drawn on it so that its image, which is formed by reflection on a biconical convex surface, becomes a precise radial set of circular targets if the surface under test is perfect. This null-screen avoids alignment difficulties of the test system due to the contour of the face (eyebrows, nose or eyelids). In addition, the proposed method prevents the targets from overlapping and touching each other. We discuss how to integrate the system to calibrate it by testing a spherical and a biconical surface on which we obtain geometrical parameters such as radius of curvature and conic constant, as well as elevation, and sagittal and meridional curvature maps with a smartphone-based corneal topographer.

Conference Presentation

Citation Download Citation

Manuel Campos-García, Oliver Huerta-Carranza, Luis Ángel Pantoja-Arredondo, Ángel Sinue Cruz-Félix, Agustin Santiago-Alvarado, Daniel Aguirre-Aguirre, Víctor Iván Moreno-Oliva, and Christian Camargo-Fierro "Conical null-screen design for evaluating a biconical surface using a smartphone-based corneal topographer", Proc. SPIE 12221, Optical Manufacturing and Testing XIV, 122210L (3 October 2022); https://doi.org/10.1117/12.2633701

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