Open AccessForward light scatter analysis of the eye in a spatially-resolved double-pass optical system
Author(s) -
Jayoung Nam,
Larry N. Thibos,
Arthur Bradley,
Nikole Himebaugh,
Haixia Liu
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.007417
Subject(s) - wavefront , optics , human eye , physics , zernike polynomials , optical transfer function , image quality , adaptive optics , wavefront sensor , point spread function , computer science , image (mathematics) , computer vision
An optical analysis is developed to separate forward light scatter of the human eye from the conventional wavefront aberrations in a double pass optical system. To quantify the separate contributions made by these micro- and macro-aberrations, respectively, to the spot image blur in the Shark-Hartmann aberrometer, we develop a metric called radial variance for spot blur. We prove an additivity property for radial variance that allows us to distinguish between spot blurs from macro-aberrations and micro-aberrations. When the method is applied to tear break-up in the human eye, we find that micro-aberrations in the second pass accounts for about 87% of the double pass image blur in the Shack-Hartmann wavefront aberrometer under our experimental conditions.