title: Centroid displacement statistics of the eye aberration.
abstract: We discuss a method for the study of the spatial statistics of the ocular aberrations, based on the direct use of the Hartmann-Shack centroid displacements, avoiding the wavefront reconstruction step. Centroid diagrams are introduced as a helpful aid to visualize basic properties of the aberration datasets, and slope-related second-order statistical functions are applied to check the compatibility between the experimental data and different models for the aberration statistics. Preliminary results suggest that no single power-law spectrum (e.g., Kolmogorov's) is able to represent the whole range of spatial statistics of individual eye fluctuations and that more elaborated models, including at least the contribution of a relevant defocus fluctuation term, are required. This centroid-based approach allows for an easier intercomparison of results between laboratories and avoids the bias and information loss associated with the estimation of a reduced number of Zernike coefficients from a much wider slope data set.
authors.affiliation: Area de Optica, Departamento de Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galiza, Spain.
authors.forename: Eliseo
authors.initials: E
authors.lastname: Pailos
authors.forename: Abbas
authors.initials: A
authors.lastname: Ommani
authors.forename: Luis
authors.initials: L
authors.lastname: Diaz-Santana
authors.forename: Salvador
authors.initials: S
authors.lastname: Bará
mesh_terms: D057108:Corneal Wavefront Aberration / Q000503:physiopathology; D005128:Eye Diseases / Q000503:physiopathology*; D006801:Humans; D008954:Models, Biological