title: Forward light scatter analysis of the eye in a spatially-resolved double-pass optical system.
abstract: 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.
authors.affiliation: School of Optometry, Indiana University, 800 Atwater Avenue, Bloomington, Indiana 47405, USA. jnam@indiana.edu
authors.forename: Jayoung
authors.initials: J
authors.lastname: Nam
authors.forename: Larry N
authors.initials: LN
authors.lastname: Thibos
authors.forename: Arthur
authors.initials: A
authors.lastname: Bradley
authors.forename: Nikole
authors.initials: N
authors.lastname: Himebaugh
authors.forename: Haixia
authors.initials: H
authors.lastname: Liu
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004867:Equipment Design; D006801:Humans; D008027:Light; D015233:Models, Statistical; D009799:Ocular Physiological Phenomena; D055096:Optical Devices; D055095:Optics and Photonics; D012542:Scattering, Radiation; D013666:Tears; D014785:Vision, Ocular