# US 2025/0032318 A1 · Device and method for producing control data for the surgical correction of the defective eye vision > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0032318 A1 - Document ID: US20250032318A1 - Status: Published application - Kind: A1 - Application number: 18/789,935 - Filed: 2024-07-31 - Published: 2025-01-30 - Earliest claimed: 2009-01-21 - Applicants: Carl Zeiss Meditec AG - Inventors: Gregor Stobrawa; Mark Bischoff - Web page: https://patentgrep.com/patent/US20250032318A1 ## CPC - A61F 9/008: using laser - A61F 9/00827: {Refractive correction, e.g. lenticle} - A61F 9/00836: {Flap cutting} - A61F 9/00829: {Correction of higher orders} - A61F 9/00838: {Correction of presbyopia} - A61F 2009/00872: {Cornea} - A61F 2009/0088: {based on wavefront} - A61F 2009/00882: {based on topography} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## 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). ## Claims ### Claim 1 (canceled) ### Claim 2 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. ### Claim 3 (depends on 2) The method according to claim 2, wherein calculating the optical parameter of the cornea reduced by the subsurface volume comprises either calculating a radius of curvature RCV* of the cornea reduced by the subsurface volume, wherein the radius of curvature RCV* is location-dependent and satisfies the equation RCV*(r,φ)=1/((1/RCV(r,φ))+BCOR(r,φ)/(nC−1))+F, wherein RCV(r,φ) is a local radius of curvature of the cornea before removal of the volume (18), nc is the refractive index of the material of the cornea, F is an optional correction value, and BCOR(r,φ) is the local refractive power change in a plane lying at the vertex of the cornea, this change being necessary for the desired correction of defective vision, or calculating a refractive power BCV* of the cornea reduced by the subsurface volume, which refractive power is location-dependent and satisfies the equation B CV * ( r , φ ) = 1 1 B C ⁢ V ( r , φ ) + B C ⁢ O ⁢ R ( r , φ ) + F ( n C - 1 ) wherein BCV(r,φ) is the local refractive power of the cornea before removal of the volume, wherein there are at least two radii r1 and r2 for which BCOR(r=r1,φ)≠BCOR(r=r2,φ) holds true. ### Claim 4 (depends on 2) The method according to claim 2, wherein the refractive power change decreases to zero beyond a scotopic pupil radius. ### Claim 5 (depends on 2) The method according to claim 2, wherein the refractive power change continuously decreases with increasing radius at least beyond a scotopic pupil radius. ### Claim 6 (depends on 2) The method according to claim 2, wherein there are two radii around which a radial function of the refractive power change is constant, wherein the refractive power change has different value at the two radii and changes between these different values either stepwise or continuously. ### Claim 7 (depends on 2) The method according to claim 2, wherein the refractive power change is adapted to correct presbyopia by implanting a lens into a central area of the cornea. ### Claim 8 (depends on 7) The method according to claim 7, wherein the refractive power change is adapted to correct myopia at far vision by extraction tissue from the cornea. ### Claim 9 (depends on 10) The method according to claim 10, wherein a thickness of the lens to be implanted is at least in parts of the lens larger than a thickness of the tissue to be extracted. ### Claim 10 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. ### Claim 11 (depends on 10) The control data generating device according to claim 10, wherein the computer and the program together are configured to calculate an optical parameter of the cornea reduced by the subsurface volume by either calculating a radius of curvature RCV* of the cornea reduced by the subsurface volume, wherein the radius of curvature RCV* is location-dependent and satisfies the equation RCV*(r,φ)=1/((1/RCV(r,φ))+BCOR(r,φ)/(nc−1))+F, wherein RCV(r,φ) is a local radius of curvature of the cornea before removal of the volume (18), nC is the refractive index of the material of the cornea (5), F is an optional correction value, and BCOR(r,φ) is the local refractive power change in a plane lying at the vertex of the cornea, this change being necessary for the desired correction of defective vision, or calculating a refractive power BCV* of the cornea reduced by the subsurface volume, which refractive power is location-dependent and satisfies the equation B CV * ( r , φ ) = 1 1 B C ⁢ V ( r , φ ) + B C ⁢ O ⁢ R ( r , φ ) + F ( n C - 1 ) wherein BCV(r,φ) is the local refractive power of the cornea before removal of the volume (18), wherein there are at least two radii r1 and r2 for which BCOR(r=r1,φ)≠BCOR(r=r2,φ) holds true. ### Claim 12 (depends on 10) The control data generating device according to claim 10, wherein the refractive power change decreases to zero beyond a scotopic pupil radius. ### Claim 13 (depends on 10) The control data generating device according to claim 10, wherein the refractive power change is continuously decreased with increasing radius at least beyond a scotopic pupil radius. ### Claim 14 (depends on 10) The control data generating device according to claim 10, wherein there are two radii around which a radial function of the refractive power change is constant, wherein the refractive power change has different value at the two radii and changes between these different values either stepwise or continuously. ### Claim 15 (depends on 10) The control data generating device according to claim 10, wherein the refractive power change is adapted for correcting presbyopia by implanting a lens into a central area of the cornea. ### Claim 16 (depends on 10) The control data generating device according to claim 10, wherein the refractive power change is adapted for correcting myopia at far vision by extraction of tissue from the cornea. ### Claim 17 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. ### Claim 18 (depends on 17) The method according to claim 17, wherein calculating an optical parameter of the cornea reduced by the subsurface volume comprises either calculating a radius of curvature RCV* of the cornea reduced by the subsurface volume, wherein the radius of curvature RCV* is location-dependent and satisfies the equation RCV*(r,φ)=1/((1/RCV(r,φ))+BCOR(r,φ)/(nc−1))+F, wherein RCV(r,φ) is a local radius of curvature of the cornea before removal of the volume (18), nC is the refractive index of the material of the cornea (5), F is an optional correction value, and BCOR(r,φ) is the local refractive power change in a plane lying at the vertex of the cornea, this change being necessary for the desired correction of defective vision, or calculating a refractive power BCV* of the cornea reduced by the subsurface volume, which refractive power is location-dependent and satisfies the equation B CV * ( r , φ ) = 1 1 B C ⁢ V ( r , φ ) + B C ⁢ O ⁢ R ( r , φ ) + F ( n C - 1 ) wherein BCV(r,φ) is the local refractive power of the cornea before removal of the volume (18), wherein there are at least two radii r1 and r2 for which BCOR(r=r1,φ)≠BCOR(r=r2,φ) holds true. ### Claim 19 (depends on 17) The method according to claim 17, comprising correcting presbyopia by implanting a lens into a central area of the cornea. ### Claim 20 (depends on 19) The method according to claim 19, comprising correcting myopia at far vision by extraction of tissue from the cornea. ### Claim 21 (depends on 20) The method according to claim 20, wherein a thickness of the lens implanted is at least in parts of the lens larger than a thickness of the extracted tissue.