Work

Correlation between radius and asphericity in surfaces fitted by conics

Year: 2010

Type: article

Abstract: The optical surfaces of the eye are often described in terms of their radius and asphericity. The variations caused by experimental noise in repeated measurements of radius and asphericity of the same surface are strongly correlated. We show this correlation in experimental corneal elevation data from videokeratoscopy and Scheimpflug topography, in non-contact profilometry data of artificial lenses, and in simulations. The effect is a characteristic of the fits to conic curves, and not restricted to any experimental device or fitting procedure. A separate analysis of radius and asphericity may estimate incorrectly the statistical significance of the changes in the ocular surfaces. We propose a MANOVA-based statistical analysis that increases sensitivity by a factor of 4.

Source: Journal of the Optical Society of America A

DOI: 10.1364/josaa.27.001541

Authors: Alfonso Pérez-Escudero, Carlos Dorronsoro, Susana Marcos

Institutions: Consejo Superior de Investigaciones Científicas, Instituto de Óptica "Daza de Valdés"

Language: English

Topic: Corneal surgery and disorders

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

Open Access status: bronze

Funder: Ministerio de Ciencia e Innovación

Awards: G1518658144, G8720408925