Ablation apparatus for ablating a cornea by laser beam

  • US 5,445,633 A
  • Filed: 10/25/1994
  • Issued: 08/29/1995
  • Est. Priority Date: 11/07/1992
  • Status: Expired due to Term
First Claim
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1. An ablation apparatus for ablating a surface of a cornea to form a transition zone for myopia correction by laser beam, comprising:

  • a laser source for emitting a laser beam;

    an ablation optical system for ablating the surface of the cornea by the laser beam emitted from said laser source;

    ablation area changing means for changing an ablation area on the cornea;

    cornea shape forming means for forming a shape of an optical zone of the cornea, the radius of curvature of the shape of the optical zone being larger than the radius of curvature of a pre-operation cornea, by superposing the laser beam through said ablation optical system;

    input means for inputting data related to the transition zone, the transition zone to have a shape for smoothly connecting said optical zone with a non-ablation area; and

    control means for determining the shape of said transition zone, based on the data and based on a curvature of a pre-operation cornea and a desired post operation cornea, and for controlling movement of said ablation area changing means to achieve the shape of the transition zone.

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