Asian Journal of Physics Vol. 33, Nos 5 & 6 (2024) 349-368

Null screens and corneal topography

Rufino Díaz-Uribe1, Martín Isaías Rodríguez-Rodríguez2, and Yobani Mejía3
1Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Apdo. Postal 70-186, México City, 104510, Mexico
2Facultad de Estudios Superiores Iztacala UNAM, Avenida de los Barrios No. 1 Col. Los Reyes Iztacala, Tlalnepantla Estado de México C.P. 54090, Mexico
3Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia

This paper presents a review of the null screen test method for measuring the anterior surface of the cornea. The paper is focused on the field curvature and the skew ray problem, both present in the specular topographers based on the Placido disc targets, and how they can be solved by the null screen method. The main issues related to this technique such as null-screen design, setup, quantitative evaluation methods and different target configurations used in experimental and commercial devices are reviewed. This review shows that the Null-Screen testing method has become an important tool for measuring the anterior surface of human corneas. © Anita Publications. All rights reserved.
Doi: 10.54955/AJP.33.5-6.2024.349-368
Keywords: Optical Deflectometry, Null Screens, Corneal Topography.

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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