Laser surgical method of sculpting a patient's cornea and associated intermediate controlling mask
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United States of America Patent
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Dec 27, 1994
Grant Date -
N/A
app pub date -
Oct 26, 1993
filing date -
Oct 26, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser (e.g., excimer laser) and masking apparatus performs controlled sculpting of eye surfaces, such as corneal surfaces. The masking system includes a single/multi-layer (e.g., metallic) coated substrate (e.g., fused silica) with multiple openings in the substrate of desired size, shape and spacing to control the power transmission of a laser used in conjunction with the mask. The power transmission is controlled through the use of diffraction and absorption. The power transmission can be attuned to a particular surface by using topographical information of the surface in question. The surgeon can observe the topographical information and then pattern the openings (size, number, shape, spacing) so that reshaping can be done with greater intensity (using larger or more openings) to remove more corneal tissue in areas that the surgeon feels need more reshaping. Areas that need less reshaping can be masked complete by not placing holes or openings in that area of the mask, or by placing fewer or smaller openings.
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