Carl Zeiss Meditec Ag

Carl Zeiss Meditec Gmbh

Xunchang Chen

Scott A Meyer

Rudolf Murai Von Bünau

Burkhard Wagner

Rodney P Chin

Burkhart Wagner

A method for calculating the power of an intraocular lens including measuring an axial separation between the front surface of the cornea and the plane of the iris root; and determining the power of the intraocular lens using the measured axial separation together with other measured parameters and empirically determined lens constants.

Method for determining the power of an intraocular lens

For the pre-operative calculation of the power of an intraocular lens, three input parameters are needed: the axial length of the eye (AL), the refractive power of the cornea, and the distance between the front of the cornea and the back focal plane of the intraocular lens, the so-called effective lens position (ELP). The invention shows a novel approach to the determination of the ELP.

A method and apparatus for imaging within the eye is provided whereby a component of eye position is detected using optical imaging data. Tracking eye position over time and correctly registering imaging data for scan locations or using eye position to detect decentration achieves improved imaging. In one embodiment, essentially perpendicular B-scans are imaged sequentially and the corneal arc within each B-scan is analyzed to determine the vertex of the eye. The eye vertex is tracked over pairs of perpendicular B-scans to determine eye motion. In another embodiment, the decentration in the Pachymetry map is removed by correcting for the misalignment of the center of the Pachymetry map and the actual location of the corneal vertex.

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Pleasanton, CA, United States of America

Xunchang Chen