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Applied Optics

Applied Optics


  • Vol. 44, Iss. 10 — Apr. 1, 2005
  • pp: 1831–1837

Wavelength dependence of the apparent diameter of retinal blood vessels

Robert Park, Karen Twietmeyer, Russell Chipman, Neil Beaudry, and David Salyer  »View Author Affiliations

Applied Optics, Vol. 44, Issue 10, pp. 1831-1837 (2005)

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Imaging of retinal blood vessels may assist in the diagnosis and monitoring of diseases such as glaucoma, diabetic retinopathy, and hypertension. However, close examination reveals that the contrast and apparent diameter of vessels are dependent on the wavelength of the illuminating light. In this study multispectral images of large arteries and veins within enucleated swine eyes are obtained with a modified fundus camera by use of intravitreal illumination. The diameters of selected vessels are measured as a function of wavelength by cross-sectional analysis. A fixed scale with spectrally independent dimension is placed above the retina to isolate the chromatic effects of the imaging system and eye. Significant apparent differences between arterial and venous diameters are found, with larger diameters observed at shorter wavelengths. These differences are due primarily to spectral absorption in the cylindrical blood column.

© 2005 Optical Society of America

OCIS Codes
(170.0110) Medical optics and biotechnology : Imaging systems
(170.4470) Medical optics and biotechnology : Ophthalmology
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics

Original Manuscript: July 21, 2004
Revised Manuscript: November 15, 2004
Manuscript Accepted: November 9, 2004
Published: April 1, 2005

Robert Park, Karen Twietmeyer, Russell Chipman, Neil Beaudry, and David Salyer, "Wavelength dependence of the apparent diameter of retinal blood vessels," Appl. Opt. 44, 1831-1837 (2005)

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