US 12,076,275 B2
Device and method for producing control data for the surgical correction of the defective eye vision
Gregor Stobrawa, Jena (DE); and Mark Bischoff, Jena (DE)
Assigned to Carl Zeiss Meditec AG, Jena (DE)
Filed by Carl Zeiss Meditec AG, Jena (DE)
Filed on Nov. 6, 2020, as Appl. No. 17/091,960.
Application 17/091,960 is a division of application No. 14/707,578, filed on May 8, 2015, granted, now 10,828,197.
Application 14/707,578 is a division of application No. 13/145,761, granted, now 9,050,172, issued on Jun. 9, 2015, previously published as PCT/EP2010/050700, filed on Jan. 21, 2010.
Claims priority of application No. 102009005482.0 (DE), filed on Jan. 21, 2009.
Prior Publication US 2021/0121323 A1, Apr. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 9/008 (2006.01)
CPC A61F 9/008 (2013.01) [A61F 9/00827 (2013.01); A61F 9/00836 (2013.01); A61F 9/00829 (2013.01); A61F 9/00838 (2013.01); A61F 2009/00872 (2013.01); A61F 2009/0088 (2013.01); A61F 2009/00882 (2013.01)] 17 Claims
OG exemplary drawing
 
1. 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, the control data generating device comprising:
a computer operating under control of a program, the computer and the program together being configured to generate the control data to control the laser system to focus the laser radiation to different focus positions located within the cornea such that the at least one cut isolates a subsurface volume in the cornea, the subsequent removal of which subsurface volume from the cornea effects a desired correction of the defective vision,
the computer being operatively coupled to the laser system, wherein the laser system includes at least a laser and optics for emitting laser radiation to generate the at least one cut in the cornea of the eye,
the computer and the program together being configured to determine the control data by calculating an optical parameter of the cornea reduced by the subsurface volume,
wherein the optical parameter is locally varying and the optical parameter is either a radius of curvature R*CV(r,φ) of the cornea reduced by the subsurface volume or an optical refraction power B*CV(r,φ) the cornea has without the subsurface volume,
wherein the optical parameter is the optical refraction power B*CV(r,φ) the cornea has without the subsurface volume and wherein the computer and the program together are configured to calculate optical refraction power B*CV(r,φ) using the following equation:

OG Complex Work Unit Math
wherein BCV(r,φ) is a local optical refraction power of the cornea before the subsurface volume is removed, nc is the refractive index of the material of the cornea, F is a coefficient, and BCOR(r,φ) is a local change in optical refraction power in a plane lying in the vertex of the cornea and required for the desired correction of the defective vision, and
the computer and the program together being configured to transfer the control data to the laser system to guide the laser system during a surgical procedure, the laser system using the control data to direct laser radiation to generate the at least one cut in the cornea of the eye.