SPHERICAL-ABERRATION OF THE REDUCED SCHEMATIC EYE WITH ELLIPTIC REFRACTING SURFACE

Citation
Ln. Thibos et al., SPHERICAL-ABERRATION OF THE REDUCED SCHEMATIC EYE WITH ELLIPTIC REFRACTING SURFACE, Optometry and vision science, 74(7), 1997, pp. 548-556
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ophthalmology
ISSN journal
1040-5488
Volume
74
Issue
7
Year of publication
1997
Pages
548 - 556
Database
ISI
SICI code
1040-5488(1997)74:7<548:SOTRSE>2.0.ZU;2-L
Abstract
We extend the single-surface schematic-eye model of ocular chromatic a berration to account for spherical aberration of the eye. This extensi on is accomplished by allowing the model's single refracting surface t o be a member of the family of ellipses with variable shape parameter (eccentricity). The resulting model, dubbed the ''Indiana Eye,'' may h ave either positive or negative spherical aberration of varying degree , depending upon the numerical value of the shape parameter. Spherical aberration of the model eye is well described by third-order optical theory for shape parameters in the range 0 less than or equal to p les s than or equal to 0.7, but requires fifth-order theory for an accurat e description over the parametric range 0.7 < p less than or equal to 1.0. An improved technique was devised for fitting the model to publis hed measurements of ray aberrations while avoiding errors of estimatio n of the degree of spherical aberration present in eyes which also man ifest odd-symmetric aberrations, such as coma. A shape parameter value of approximately p = 0.6 provided the best fit of the model to select ed data from the literature.