Ocular modeling methods and apparatus
AssigneeNovartis AG
InventorEugene Ng
Life of this patent
Estimating the term…
Abstract
A method and apparatus for modeling a lens of an eye, comprising: measuring the anterior shape of the eye's cornea; determining direct optical measurements of at least one parameter of the cornea and at least one parameter of the lens; determining the refractive index of the cornea; correcting the optical measurements to account for the effect of the refractive index of the cornea on the direct optical measurements; measuring the aberration of the eye; calculating the refractive index of the lens by combining the corrected measurements and the measured aberration; and further correcting the optical measurements of the lens to account the effect of the refractive index of the lens on the direct optical measurements.
Claims29
A method of modelling modeling a lens of an eye having a cornea, the method comprising:
- measuring an anterior shape of the cornea;
- determining direct optical measurements of at least one parameter of the cornea and at least one parameter of the lens;
- determining a refractive index of the cornea;
- correcting the optical measurements to form corrected measurements by accounting for an effect of the refractive index of the cornea on the direct optical measurements;
- measuring an aberration of the eye;
- calculating a refractive index of the lens by combining the corrected measurements and the measured aberration;
- and
- further correcting the optical measurements of the lens to account the effect of the refractive index of the lens on the direct optical measurements.
The method of 1 wherein the refractive index of the cornea is determined using at least one of:
- a refractometer and by combining the direct optical measurements of the cornea of the eye.
5-7. (canceled)
9-11. (canceled)
(canceled)
(canceled)
A method of determining an optimum position for a replacement intraocular lens based on an effective position of a natural lens, having an anterior surface and a posterior surface, the method comprising:
- modeling the natural lens using the method of 1 to determine the anterior and posterior surfaces of the natural lens;
- and approximating a best fit curve for the posterior surface using the anterior lens surface, the lens thickness and a historical ratio between the anterior and posterior lens curvatures.
An apparatus for modeling a lens of an eye comprising:
- means for measuring an anterior shape of the eye's cornea;
- means for determining direct optical measurements of at least one parameter of the cornea and at least one parameter of the lens;
- means for determining a refractive index of the cornea;
- means for correcting the optical measurements to account for an effect of the refractive index of the cornea on the direct optical measurements;
- means for measuring an aberration of the eye;
- means for calculating a refractive index of the lens by combining the corrected measurements and the aberration;
- and
- means for further correcting the optical measurements of the lens to account the effect of the refractive index of the lens on the direct optical measurements.
(canceled)
(canceled)
(canceled)
28-31. (canceled)
The apparatus of claim 31 wherein the means for measuring the posterior shape of the cornea of the eye comprises:
- means for capturing one or more images of a pattern of laser spots generated on the posterior surface of the cornea by the laser array source;
- means for forming an averaged image from the captured images;
- and
- means for comparing the averaged image to spacing and arrangement of the lasers of the laser array source.
The apparatus of claim 31 wherein the means for computing the anterior lens shape comprises:
- means for capturing one or more images of a pattern of laser spots generated on the anterior surface of the lens by the laser array source;
- means for forming an averaged image from the captured images;
- and
- means for comparing the averaged image to spacing and arrangement of the lasers of the laser array source.
36-41. (canceled)
Dependencies are inferred from the claim text.