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Multifractal nature of ocular aberration dynamics of the human eye
Ocular monochromatic aberrations display dynamic behavior even when the eye is fixating on a stationary stimulus. The fluctuations are commonly characterized in the frequency domain using the power spectrum obtained via the Fourier transform. In this paper we used a wavelet-based multifractal analyt...
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Formato: | Texto |
Lenguaje: | English |
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Optical Society of America
2011
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047352/ https://www.ncbi.nlm.nih.gov/pubmed/21412452 http://dx.doi.org/10.1364/BOE.2.000464 |
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author | Hampson, Karen M. Mallen, Edward A. H. |
author_facet | Hampson, Karen M. Mallen, Edward A. H. |
author_sort | Hampson, Karen M. |
collection | PubMed |
description | Ocular monochromatic aberrations display dynamic behavior even when the eye is fixating on a stationary stimulus. The fluctuations are commonly characterized in the frequency domain using the power spectrum obtained via the Fourier transform. In this paper we used a wavelet-based multifractal analytical approach to provide a more in depth analysis of the nature of the aberration fluctuations. The aberrations of five subjects were measured at 21 Hz using an open-view Shack-Hartmann sensor. We show that the aberration dynamics are multifractal. The most frequently occurring Hölder exponent for the rms wavefront error, averaged across the five subjects, was 0.31 ± 0.10. This suggests that the time course of the aberration fluctuations is antipersistant. Future applications of multifractal analysis are discussed. |
format | Text |
id | pubmed-3047352 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Optical Society of America |
record_format | MEDLINE/PubMed |
spelling | pubmed-30473522011-03-16 Multifractal nature of ocular aberration dynamics of the human eye Hampson, Karen M. Mallen, Edward A. H. Biomed Opt Express Vision, Color, and Visual Optics Ocular monochromatic aberrations display dynamic behavior even when the eye is fixating on a stationary stimulus. The fluctuations are commonly characterized in the frequency domain using the power spectrum obtained via the Fourier transform. In this paper we used a wavelet-based multifractal analytical approach to provide a more in depth analysis of the nature of the aberration fluctuations. The aberrations of five subjects were measured at 21 Hz using an open-view Shack-Hartmann sensor. We show that the aberration dynamics are multifractal. The most frequently occurring Hölder exponent for the rms wavefront error, averaged across the five subjects, was 0.31 ± 0.10. This suggests that the time course of the aberration fluctuations is antipersistant. Future applications of multifractal analysis are discussed. Optical Society of America 2011-02-01 /pmc/articles/PMC3047352/ /pubmed/21412452 http://dx.doi.org/10.1364/BOE.2.000464 Text en ©2011 Optical Society of America http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially. |
spellingShingle | Vision, Color, and Visual Optics Hampson, Karen M. Mallen, Edward A. H. Multifractal nature of ocular aberration dynamics of the human eye |
title | Multifractal nature of ocular aberration dynamics of the human eye |
title_full | Multifractal nature of ocular aberration dynamics of the human eye |
title_fullStr | Multifractal nature of ocular aberration dynamics of the human eye |
title_full_unstemmed | Multifractal nature of ocular aberration dynamics of the human eye |
title_short | Multifractal nature of ocular aberration dynamics of the human eye |
title_sort | multifractal nature of ocular aberration dynamics of the human eye |
topic | Vision, Color, and Visual Optics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047352/ https://www.ncbi.nlm.nih.gov/pubmed/21412452 http://dx.doi.org/10.1364/BOE.2.000464 |
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