Methods and systems for predicting the post-operative effective lens position in cataract surgery
AssigneeThe Regents of the University of California
InventorsJames Tucker, Matthew Wade, Sumit Garg, Caleb Shumway
Life of this patent
Estimating the term…
Abstract
Methods and systems for predicting the post-operative effective lens position (ELP) of a prosthetic intraoccular lens (IOL) in cataract surgery using novel pre-operative measurement(s) of the natural lens curvatures.
Claims11
A system for estimating effective lens position (ELP) of an intraocular lens (IOL) prior to implantation of said IOL in a phakic eye having a native lens, said system comprising:
- at least one biometric apparatus for obtaining at least one measurement of a curvature of the native lens of the eye prior to removal of said native lens;
- and
- a computer or processor programmed to determine with use of said measurement, said estimated effective lens position (ELP);
- wherein said at least one measurement indicative of a curvature of the native lens comprises a measurement of an anterior lens surface curvature and a measurement of a posterior lens surface curvature;
- and
- wherein the computer or processor is programmed to use the measurement of an anterior lens surface curvature and the measurement of a posterior lens surface curvature to calculate a lens meridian position (LMP) by determining the sum of anterior chamber depth (ACD) and the portion of the lens thickness (LT) that lies anterior to the lens meridian position (LMP).
A system for estimating effective lens position (ELP) of an intraocular lens (IOL) prior to implantation of said IOL in a phakic eye having a native lens, said system comprising:
- at least one biometric apparatus for obtaining at least one measurement of a curvature of the native lens of the eye prior to removal of said native lens;
- and
- a computer or processor programmed to determine with use of said measurement, said estimated effective lens position (ELP);
- wherein the said at least one biometric apparatus is operative to:
- obtain a pre-operative image of a phakic eye having a native lens;
- and
- determine, from the pre-operative image, an anterior chamber depth (ACD);
- and
- wherein the computer or processor is programmed to:
- determine, from the pre-operative image, a lens meridian position (LMP) by calculating a peripheral intersection of anterior and posterior lens surface curvatures within a central portion of the native crystalline lens;
- and
- use the lens meridian position LMP to calculate said estimated effective lens position (ELP).
A system for estimating effective lens position (ELP) of an intraocular lens (IOL) prior to implantation of said IOL in a phakic eye having a native lens, said system comprising:
- at least one biometric apparatus for obtaining at least one measurement of a curvature of the native lens of the eye prior to removal of said native lens;
- and
- a computer or processor programmed to determine with use of said measurement, said estimated effective lens position (ELP);
- wherein said at least one biometric apparatus determines anterior chamber depth (ACD), thickness of the native lens (LT), and the anterior and posterior surface curvatures of the native lens;
- and
- wherein the computer or processor is programmed to:
- calculate relative and fractional lens meridian positions (rLMP and fLMP);
- calculate approximate fractional effective lens position (fELP);
- and
- determine said estimated effective lens position (ELP) using a regression model.
Dependencies are inferred from the claim text.