Design of a null-screen for a compact corneal topographer

Manuel Campos-García; Daniel Aguirre-Aguirre; José Antonio Lechuga-Núñez; Andrés Peña-Conzuelo

doi:10.1117/12.2526241

21 June 2019 Design of a null-screen for a compact corneal topographer

Manuel Campos-García, Daniel Aguirre-Aguirre, José Antonio Lechuga-Núñez, Andrés Peña-Conzuelo

Proceedings Volume 11057, Modeling Aspects in Optical Metrology VII; 110570I (2019) https://doi.org/10.1117/12.2526241
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

In this work we report the design of a null-screen for corneal topography. Here we assume that the corneal surface is an ellipsoid with a diameter of 12 mm and a radius of curvature of 7.8 mm. To avoid difficulties in the alignment of the test system due to the face contour (eyebrows, nose, or eyelids), we designed a compact conical null-screen with spots drawn in such a way that its image, which is formed by reflection on the test surface, it becomes an exact semi-radial array of circular spots if the surface is perfect. To validate our proposal, we perform topography measurements of a reference surface and some human corneas using a probabilistic algorithm. The results obtained with our algorithm were consistent and we can recover the shape of the surface with accuracy.

Conference Presentation

Citation Download Citation

Manuel Campos-García, Daniel Aguirre-Aguirre, José Antonio Lechuga-Núñez, and Andrés Peña-Conzuelo "Design of a null-screen for a compact corneal topographer", Proc. SPIE 11057, Modeling Aspects in Optical Metrology VII, 110570I (21 June 2019); https://doi.org/10.1117/12.2526241

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available