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- Title
Modelling the effects of secondary spherical aberration on refractive error, image quality and depth of focus.
- Authors
Xu, Renfeng; Bradley, Arthur; López Gil, Norberto; Thibos, Larry N.
- Abstract
Purpose To examine the role of Zernike secondary spherical aberration and its component terms on refraction, image quality and depth of focus. Methods Computational methods were used to define wavefronts with controlled levels of r6, r4 and r2 terms, and image quality associated with these terms for a range of target vergences. Target vergences that generated maximum image quality were used as an objective measures of refractive error. Results Unlike primary Zernike spherical aberration, which generates peak image quality with a near paraxial focus, in the absence of other higher order aberrations, peak image quality with secondary spherical aberration is achieved with a near marginal focus. When alone, positive primary and secondary spherical aberration induce small hyperopic shifts in refraction, but in the presence of other higher order aberrations, secondary spherical aberration can induce significant myopic shifts in refractive error, as predicted by the combined lower order r4 & r2 component of
- Subjects
SPHERICAL aberration; REFRACTIVE errors; VISION disorders; MYOPIA; OPTOMETRY
- Publication
Ophthalmic & Physiological Optics, 2015, Vol 35, Issue 1, p28
- ISSN
0275-5408
- Publication type
Article
- DOI
10.1111/opo.12185