System and method for determining birefringence of anterior segment of a patient's eye
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United States of America Patent
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Mar 12, 2002
Grant Date -
N/A
app pub date -
Dec 1, 2000
filing date -
Dec 1, 2000
priority date (Note) -
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Abstract
The magnitude and axial orientation of birefringence of the anterior and the posterior segments of the human eye are determined. The anterior segment includes essentially the combined birefringence of the cornea and the crystalline lens, and the posterior segment includes regions at the fundus. The optical axis and the magnitude of the birefringence of the anterior segment is first determined, then the birefringence of the posterior segment is nulled by a variable retarder. The birefringence of the posterior segment is then determined without interference of the birefringence of the anterior segment. The apparatus and method are applicable to the measurement of the birefringence of the retinal nerve fiber layer at the peripapillary region and the birefringence of the Henle fiber layer at the macular region of the retina.
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