Method and system for removing the effects of corneal birefringence from a polarimetric image of the retina
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United States of America Patent
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Oct 30, 2007
Grant Date -
Feb 10, 2005
app pub date -
May 26, 2004
filing date -
Sep 30, 2002
priority date (Note) -
Expired
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Abstract
A scanning laser polarimetry (SLP) system that measures retinal nerve fiber layer (RNFL) retardance in a single scan image with improved sensitivity. An external bias retarder in combination with the anterior segment retardance forms a nonzero joint retardance adapted to enhance the signal-to-noise ratio (SNR) of the SLP system. With such a simple bias retarder, the effects of anterior segment retardance (.delta..sub.C, .theta..sub.C) may be removed from a single polarimetric image of the retina without a direct cancellation by a variable corneal compensator (VCC) by the method of this invention. Using a single polarimetric image is particularly advantageous for simplicity and accurate corneal compensation. The simple bias retarder may be embodied as a VCC or any useful external retarder, for example.
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