Thickness and birefringence of retinal nerve fiber layer of healthy and glaucomatous subjects measured with polarization-sensitive optical coherence tomography

Barry Cense; Teresa C. Chen; B. Hyle Park; Mark C. Pierce; Johannes F. de Boer

doi:10.1117/12.532717

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13 July 2004 Thickness and birefringence of retinal nerve fiber layer of healthy and glaucomatous subjects measured with polarization-sensitive optical coherence tomography

Barry Cense; Teresa C. Chen; B. Hyle Park; Mark C. Pierce; Johannes F. de Boer

Author Affiliations +

Barry Cense,^1,2 Teresa C. Chen,^3,1 B. Hyle Park,^1,2 Mark C. Pierce,^1,2 Johannes F. de Boer^1,2
¹Harvard Medical School (United States)
²Wellman Ctr. of Photomedicine, Massachusetts General Hospital (United States)
³Massachusetts Eye and Ear Infirmary (United States)

Proceedings Volume 5314, Ophthalmic Technologies XIV; (2004) https://doi.org/10.1117/12.532717
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

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Abstract

Changes in retinal nerve fiber layer thickness and birefringence may both precede clinically detectable glaucomatous vision loss. Early detection of retinal nerve fiber layer changes may enable treatment to prevent permanent loss of vision. Polarization sensitive optical coherence tomography (PS-OCT) can provide objective information on retinal nerve fiber layer thickness and birefringence. PS-OCT scans around the optic nerve head (ONH) of two healthy young volunteers were made using 10 concentric circles of increasing radius. Both the mean retinal nerve fiber layer thickness and mean retinal nerve fiber birefringence for each of 48 sectors on a circle were determined with data analysis. Birefringence of healthy RNFL is constant as a function of scan radius but varies as a function of position around the ONH, with higher values occurring superior and inferior to the ONH. Measured double pass phase retardation per unit depth values around the ONH range between 0.10 and 0.35°/μm, equivalent to birefringence values of 1.2•10^-4 and 4.1•10^-4 respectively, measured at a wavelength of 840 nm. Consequently, conversion of phase retardation measurements (as obtained with scanning laser polarimetry) to RNFL thickness measurements, assuming a constant birefringence value, will yield thickness values that are incorrect.

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Barry Cense, Teresa C. Chen, B. Hyle Park, Mark C. Pierce, and Johannes F. de Boer "Thickness and birefringence of retinal nerve fiber layer of healthy and glaucomatous subjects measured with polarization-sensitive optical coherence tomography", Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004); doi: 10.1117/12.532717; https://doi.org/10.1117/12.532717

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KEYWORDS

Birefringence

Optical coherence tomography

Nerve

Phase measurement

Eye

Polarization

Retina

Head

Optic nerve

Tissues

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Barry Cense, Teresa C. Chen, B. Hyle Park, Mark C. Pierce, Johannes F. de Boer, "Thickness and birefringence of retinal nerve fiber layer of healthy and glaucomatous subjects measured with polarization-sensitive optical coherence tomography," Proc. SPIE 5314, Ophthalmic Technologies XIV, (13 July 2004);

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