Research Papers: Sensing

Biospeckle in the human sclera and impact on laser speckle correlation measurement of eye tremor

[+] Author Affiliations
Emer Kenny, Davis Coakley

St. James’s Hospital, Mercer’s Institute for Research on Ageing, Dublin 8, Ireland

Gerard Boyle

St. James’s Hospital, Department of Medical Physics and Bioengineering, Dublin 8, Ireland

J. Biomed. Opt. 18(9), 097009 (Sep 25, 2013). doi:10.1117/1.JBO.18.9.097009
History: Received June 30, 2013; Revised August 29, 2013; Accepted September 4, 2013
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Abstract.  Ocular microtremor (OMT) is an involuntary fixational eye movement. We identify the implications of biospeckle for a noninvasive, laser speckle correlation technique to measure OMT. Biospeckle from the in-vivo eye is characterized and, using the resulting characteristics, a mathematical model to describe the biospeckle from the eye is designed and tested. Through in-vivo measurements, biospeckle is shown to disrupt the temporal stability of the speckle images over time. However, provided each speckle image is cross correlated with the previous image within a sufficiently short time, the stability of speckle images captured from the eye is shown to be adequate to measure OMT-like displacements.

Figures in this Article
© 2013 Society of Photo-Optical Instrumentation Engineers

Topics

Eye ; Speckle ; Sclera

Citation

Emer Kenny ; Davis Coakley and Gerard Boyle
"Biospeckle in the human sclera and impact on laser speckle correlation measurement of eye tremor", J. Biomed. Opt. 18(9), 097009 (Sep 25, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.9.097009


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