| 摘要 |
<p>A laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ/cm2), to achieve optically smooth ablated corneal surfaces. The preferred laser in- cludes a laser (102) emitting approximately 100-50,000 laser pulses per second, with a wavelength of about 198-300 nm and a pulse du- ration of about 1-5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system (104).</p> |
