April 2009
Volume 50, Issue 13
ARVO Annual Meeting Abstract  |   April 2009
Describing Ocular Aberrations With Wavefront Vergence Maps
Author Affiliations & Notes
  • J. Nam
    Optometry, Indiana University, Bloomington, Indiana
  • L. N. Thibos
    Optometry, Indiana University, Bloomington, Indiana
  • D. Iskander
    Optometry, Queensland University of Technology, Brisbane, Australia
  • Footnotes
    Commercial Relationships  J. Nam, None; L.N. Thibos, None; D. Iskander, None.
  • Footnotes
    Support  NIH/NEI grant R01-EY05109
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 1553. doi:
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    • Get Citation

      J. Nam, L. N. Thibos, D. Iskander; Describing Ocular Aberrations With Wavefront Vergence Maps. Invest. Ophthalmol. Vis. Sci. 2009;50(13):1553.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose: : Wavefront aberrations are commonly described as errors of wavefront phase or optical path length. We aimed to develop an alternative description as errors of wavefront vergence derived directly from measurements of wavefront slope.

Methods: : We define wavefront vergence as radial wavefront slope normalized by radial distance from the pupil center. The result is a wavefront vergence map that is similar in concept to the power map in corneal topography and hence has a potential to be favored by clinicians. We use a recently invented set of orthogonal Zernike slope polynomials to systematically analyze details of the wavefront vergence map just as we might use Zernike polynomials for analyzing wavefront phase.

Results: : Wavefront vergence maps can be used to characterize aberrations using simple statistics such as mean, variance, skewness, and kurtosis. Vergence maps can also be described by a vector of Zernike slope coefficients that are linearly related to ordinary Zernike phase coefficients. Three different methods for converting Zernike slope coefficients to sphero-cylindrical refractive error have been derived based on different methods for weighting the contribution of different points in the pupil. Significant differences between the three methods appear when higher order aberrations are present.

Keywords: aberrations • refraction 

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