A proposal to eliminate the skew ray error in corneal topography using Placido disks images

Daniel Gomez-Tejada; Daniel Malacara Hernández

doi:10.1117/12.2529648

3 September 2019 A proposal to eliminate the skew ray error in corneal topography using Placido disks images

Daniel Gomez-Tejada, Daniel Malacara Hernández

Proceedings Volume 11102, Applied Optical Metrology III; 1110206 (2019) https://doi.org/10.1117/12.2529648
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Corneal topographers based in Placido disks are widely used for their simplicity and easy implementation, however, this technique has an inherent error known as the skew ray error, which is generated by the problem that exists during the integration to relate a single point on the Placido screen with its correspondent point in the captured image. In this research work, we present a proposal of integration to recover the corneal topography from Placido disks images, which could eliminate the skew ray error. This process is made in a post-processing step, right after a meridional integration. The proposed integration is based under the hypothesis that the meridional integration really has information about the topography changes in the angle direction. The effect of the proposed technique over a topography is presented.

Citation Download Citation

Daniel Gomez-Tejada and Daniel Malacara Hernández "A proposal to eliminate the skew ray error in corneal topography using Placido disks images", Proc. SPIE 11102, Applied Optical Metrology III, 1110206 (3 September 2019); https://doi.org/10.1117/12.2529648

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