Corneal topography with conical null-screen for non-symmetric aspheric corneas

Victor de Emanuel Armengol-Cruz; Arturo I. Osorio-Infante; Manuel Campos-García; Cesar Cossio-Guerrero; José Rufino Díaz-Uribe

doi:10.1117/12.2237372

28 September 2016 Corneal topography with conical null-screen for non-symmetric aspheric corneas

Victor de Emanuel Armengol-Cruz, Arturo I. Osorio-Infante, Manuel Campos-García, Cesar Cossio-Guerrero, José Rufino Díaz-Uribe

Author Affiliations +

Proceedings Volume 9947, Current Developments in Lens Design and Optical Engineering XVII; 994714 (2016) https://doi.org/10.1117/12.2237372
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

In this work, we will present some improvements to the conical null-screen based corneal topographer, for testing aspheric surfaces without rotational symmetry. We present the formulae to design the conical null-screen in such a way that the image on the CCD is a perfect array of spots; departures from this geometry are due to deformation or misalignment of the surface. Additionally, we will explain how to improve the algorithms to find the normals of corneal surface. Finally, we will evaluate the topography of a spherical surface.

Citation Download Citation

Victor de Emanuel Armengol-Cruz, Arturo I. Osorio-Infante, Manuel Campos-García, Cesar Cossio-Guerrero, and José Rufino Díaz-Uribe "Corneal topography with conical null-screen for non-symmetric aspheric corneas", Proc. SPIE 9947, Current Developments in Lens Design and Optical Engineering XVII, 994714 (28 September 2016); https://doi.org/10.1117/12.2237372

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