An artifact in fits to conic-based surfaces
Medical Physics
2011-05-03 v1 Biological Physics
Quantitative Methods
Abstract
It is common in Physiological Optics to fit the corneal and the lens surfaces to conic-based surfaces (usually ellipse-based surfaces), obtaining their characteristic radius of curvature and asphericity. Here we show that the variation in radius and asphericity due to experimental noise is strongly correlated. This correlation is seen both in experimental data of the corneal topographer Pentacam and in simulations. We also show that the effect is a characteristic of the geometry of ellipses, and not restricted to any experimental device or fitting procedure.
Cite
@article{arxiv.0905.0814,
title = {An artifact in fits to conic-based surfaces},
author = {Alfonso Pérez-Escudero and Carlos Dorronsoro and Susana Marcos},
journal= {arXiv preprint arXiv:0905.0814},
year = {2011}
}
Comments
5 pages, 5 figures