An artifact in fits to conic-based surfaces

Details An artifact in fits to conic-based surfaces An artifact in fits to conic-based surfaces

2009-05-06

arxiv.org/abs/0905.0814v1

J Opt Soc Am A Opt Image Sci Vis. 2010 Jul 1;27(7):1541-8

Physics

Medical Physics

5 pages, 5 figures

Scientific paper

10.1364/JOSAA.27.001541

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.

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