The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1999
Filed:
Sep. 24, 1997
Josef F Bille, Heidelberg, DE;
Heidelberg Engineering Optische Messysteme GmbH, Heidelberg, DE;
Abstract
A system for determining the birefringent topography of a birefringent sample (e.g. cornea of an eye) includes a scanning tomopgraphy unit for establishing a plane of focus and an ellipsometer for generating a laser beam that is useable to obtain a birefringent measurement of the sample. The system also includes a topography unit for determining the angle the laser beam is incident on the sample, and a computer for correcting the birefringent measurement to account for this angle of incidence. A Z-tracker unit is used to maintain a proper relationship between system components during its operation. In a refinement of the system, where the sample is the cornea of an eye, the affects of patient heart beat and respiration can be preprogrammed into the computer for use in correcting the birefringent measurement.