US 2025/0032318 A1 · DEVICE AND METHOD FOR PRODUCING CONTROL DATA FOR THE SURGICAL CORRECTION OF THE DEFECTIVE EYE VISION

Abstract

A device that produces control data for a laser device for surgical correction of vision produces control data such that the laser emits the laser radiation to isolate a volume in the cornea. The device calculates radius of curvature RCV* to determine the control data, the cornea reduced by the volume having the radius of curvature RCV* and the radius of curvature being site-specific and satisfying the equation: RCV*(r,φ)=1/((1/RCV(r,φ))+BCOR(r,φ)/(nC−1))+F, wherein RCV(r,φ) is the local radius of curvature of the cornea before the volume is removed, nC is the refractive index of the material of the cornea, F is a coefficient, and BCOR(r,φ) is the local change in refraction required for the desired correction of vision in a plane lying in the vertex of the cornea, and at least two radii r1 and r2 satisfy the equation BCOR(r=r1,φ)≠BCOR(r=r2,φ).

Claims21

Dependent claims

(canceled)

A method for generating control data that control a laser system for surgical correction of defective vision of an eye of a patient by emitting laser radiation to generate at least one cut in a cornea of the eye isolating a subsurface volume in the cornea having a peripheral border, the method comprising

defining a local optical refraction power change for the cornea, wherein the local optical refraction power change decreases in a non-stepwise manner to a value of zero which is reached at the peripheral border of the subsurface volume,
calculating an optical parameter of the cornea reduced by the subsurface volume on a basis of the local optical refraction power change, and
generating, on a basis of the optical parameter, the control data to control the laser system to focus the laser radiation to different focus positions located within the cornea to generate the at least one cut such that the subsequent removal of which subsurface volume from the cornea corrects the defective vision.

A control data generating device for generating control data that control a laser system for surgical correction of defective vision of an eye of a patient by emitting laser radiation to generate at least one cut in a cornea of the eye isolating a subsurface volume in the cornea having a peripheral border, the control data generating device comprising:

a computer operating under control of a program, the computer and the program together being configured to do the following:
defining a local optical refraction power change for the cornea, wherein the local optical refraction power change decreases in a non-stepwise manner to a value of zero which is reached at the peripheral border of the subsurface volume, and
calculating an optical parameter of the cornea reduced by the subsurface volume on basis of the local optical refraction power change,
generating, on basis of the optical parameter, the control data to control the laser system to focus the laser radiation to different focus positions located within the cornea to generate the at least one cut such that the subsequent removal of which subsurface volume from the cornea corrects the defective vision.

1 more element

A method for surgical correction of defective vision of an eye of a patient, the method comprising

emitting laser radiation to generate at least one cut in a cornea of the eye isolating a subsurface volume in the cornea having a peripheral border,
defining a local optical refraction power change for the cornea, wherein the local optical refraction power change decreases in a non-stepwise manner to a value of zero which is reached at the peripheral border of the subsurface volume,
calculating an optical parameter of the cornea reduced by the subsurface volume on basis of the local optical refraction power change, and
generating, on a basis of the optical parameter, control data to control the laser system to focus the laser radiation to different focus positions located within the cornea to generate the at least one cut such that the subsequent removal of which subsurface volume from the cornea corrects the defective vision.

1 more element

Dependencies are inferred from the claim text.

Device and method for producing control data for the surgical correction of the defective eye vision

Life of this patent

Device and method for producing control data for the surgical correction of the defective eye vision

Life of this patent

Abstract

Claims21