March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
The Scale and Spatial Distribution of Optical Aberrations That Accompany Tear Break-up
Author Affiliations & Notes
  • Jayoung Nam
    School of Optometry, Indiana University, Bloomington, Indiana
  • Nikole L. Himebaugh
    School of Optometry, Indiana University, Bloomington, Indiana
  • Arthur Bradley
    School of Optometry, Indiana University, Bloomington, Indiana
  • Haixia Liu
    School of Optometry, Indiana University, Bloomington, Indiana
  • Carolyn G. Begley
    School of Optometry, Indiana University, Bloomington, Indiana
  • Larry N. Thibos
    School of Optometry, Indiana University, Bloomington, Indiana
  • Footnotes
    Commercial Relationships  Jayoung Nam, None; Nikole L. Himebaugh, None; Arthur Bradley, None; Haixia Liu, None; Carolyn G. Begley, None; Larry N. Thibos, None
  • Footnotes
    Support  NEI Grant R01-EY05109, NIH Grant R01-EY021794, Bausch & Lomb/American Optometric Foundation William C. Ezell Fellowship
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 163. doi:https://doi.org/
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      Jayoung Nam, Nikole L. Himebaugh, Arthur Bradley, Haixia Liu, Carolyn G. Begley, Larry N. Thibos; The Scale and Spatial Distribution of Optical Aberrations That Accompany Tear Break-up. Invest. Ophthalmol. Vis. Sci. 2012;53(14):163. doi: https://doi.org/.

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

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Abstract

Purpose: : Tear film break-up (TBU) causes local, and often highly irregular changes in tear film thickness. We examined the spatial correlation between TBU and the associated optical anomalies on three different spatial scales.

Methods: : Ten subjects refrained from blinking while the time course and patterns of TBU were sequentially observed using sodium fluorescein (FL), retroillumination (RI), and Shack-Hartmann (SH) aberrometry. Wavefront error (WFE) maps were developed using Zernike polynomials, as well as a local zonal analysis of the SH data. The difference between these approaches reveals the very high order aberrations beyond those captured by standard modal fitting methods. Also, SH spot blur was quantified as a means for estimating fine scale optical perturbations in the tear film (microaberrations). Spatial correlation between TBU and optical aberrations was determined by computing the percent overlap of dark regions of the FL images and the anomalous regions of either the RI or SH images.

Results: : Increased aberrations over all three spatial scales were present in the regions of TBU. TBU induces an irregular pattern of phase advances across the pupil, with accompanying increases in lower order aberrations, higher order aberrations, very high order aberrations and micro-aberrations. Larger increases occur at the finer spatial scales.

Conclusions: : The optical aberrations following cessation of blinking correspond temporally and spatially with TBU and reveal tear thinning and exposure of a rough optical surface. In addition to optical aberrations, scatter develops in the areas of TBU, all of which will contribute to image degradation and visual disturbances following TBU.

Keywords: cornea: tears/tear film/dry eye • aberrations 
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