| 摘要 |
Methods and apparatus are disclosed for causing the optical center of the ey e to align "HIGH point" of the anterior surface of the cornea. In accordance with one aspect of the invention relating to corneal ablation procedures, the "HIGH point" ( 14) of the eye is used as the pole of a spherical surface which is fitted approximately to a portion o f the anterior surface of the cornea within a "bounded region" (16). For corneal ablation procedures, the "bounded region" comprises a generally inverted cup shaped region of the anterior surface of the eye bounded at its periphery by a plane (BP) which is substantially perpendicular to a local z-axis. During the operation local high points which project above the spherical surface are ablated. According to another aspect of the invention relating to radial keratotomy procedures, a pair of incisions (b, b') in the plane of a "great circle" are formed in the cornea to weaken and flatten it. As used herein, a "great circle" is formed by a plane containing the "HIGH point" and parallel to the local z-axis. The "bounded region" for radial keratotomy procedures is defined absolutely in terms of a circle projected onto the corneal surface which is centered about an axis passing through the "HIGH point" and parallel to the z-axis. |
