| 摘要 |
<p>An apparatus and method are provided for cutting tissue, such as cornea, to a predetermined depth by an ablative laser. A probe delivers ablative laser energy through coaxial irrigating fluids to cut the tissue, and an optical image of the site is acquired and electronically scanned to produce a voltage analog signal. The laser fire pulse is controlled by a circuit including a first gate controlled by a counter settable to maximum depth of cut and a second gate controlled by signals representing the uncut portion of the tissue.</p> |
