Patent ID: 6467906
Filing Date: 2002-10-22
Classification: A61B,A61F

Abstract:
Apparatus for measuring corneal irregularity in the eye of a patient comprising:means for considering the cornea of the eye of a patient to be divided into two hemidivisions, means for measuring astigmatism topographically in each of the two hemidivisions, to obtain respective topographic astigmatism values in said hemi divisions, the astigmatism values measured topographically in the two hemi divisions being asymmetrical, non-orthogonal or both due to the irregular astigmatism in the eye of the patient, means for plotting said topographic astigmatism values on a double angle vector diagram, and means for determining topographic disparity between the astigmatism measured in the two hemidivisions by vectorially subtracting the astigmatism values measured in the two hemidivisions, said topographic disparity being a measure of said corneal irregularity.