In-vivo measurement of the retinal birefringence with regard to corneal effects using an electro-optical ellipsometer

Bernhard C. E. Pelz; Christian Weschenmoser; Stefan Goelz; Joerg P. Fischer; Reinhard O. W. Burk; Josef F. Bille

doi:10.1117/12.260860

5 December 1996 In-vivo measurement of the retinal birefringence with regard to corneal effects using an electro-optical ellipsometer

Bernhard C. E. Pelz, Christian Weschenmoser, Stefan Goelz, Joerg P. Fischer, Reinhard O. W. Burk, Josef F. Bille

Author Affiliations +

Proceedings Volume 2930, Lasers in Ophthalmology IV; (1996) https://doi.org/10.1117/12.260860
Event: BiOS Europe '96, 1996, Vienna, Austria

Abstract

The phase retardation of light induced by the birefringent parts of the human retina in vivo is measured with an electro-optical ellipsometer using the principle of confocal imaging. A scanning unit allows to examine an area of 25 degrees by 12.5 degrees on the retina with a resolution of 256 by 128 points with both, incident and exit beam transmitting the cornea at a fixed position. Due to this fixed beam position the Muellermatrix of the cornea can be calculated using light which is specularly reflected on blood vessels lying above the nerve fiber layer of the retina. The obtained images show a homogenous radial distribution of the retinal retardation around the fovea without the appearance of the so called Haidinger brushes. The areas with the thickest nerve fiber layers, the arcuate bundles, appear in their typical arc and were measured quantitatively. In addition, an alternative method for the compensation of corneal birefringence is evaluated by focusing the light beam onto the surface of the lens. Hereby, the measured area in the center of the cornea is 3 X 0.75 mm².

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Bernhard C. E. Pelz, Christian Weschenmoser, Stefan Goelz, Joerg P. Fischer, Reinhard O. W. Burk, and Josef F. Bille "In-vivo measurement of the retinal birefringence with regard to corneal effects using an electro-optical ellipsometer", Proc. SPIE 2930, Lasers in Ophthalmology IV, (5 December 1996); https://doi.org/10.1117/12.260860

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