Refractive surgical laser apparatus and method
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United States of America Patent
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-
Apr 6, 2004
Grant Date -
Nov 1, 2001
app pub date -
Apr 6, 2001
filing date -
Dec 3, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A scanning ablation laser is disclosed having a fundamental output from a mirrored facet in the ultraviolet range, the fundamental ultraviolet output having an energy level of no greater than 10 mJ/pulse on the corneal surface. A controller controls the laser and scanning mechanism to deliver a focused and scanned pulsed output laser beam in a predetermined overlapping pattern onto a plurality of positions on a corneal surface to photoablate at least one layer of corneal tissue such that an overlap among respective ablating spots of individual pulses of the scanned pulsed output laser beam on a single ablation layer is at least 50%. The scanning mechanism may locate laser beam pulses in a random pattern on the corneal surface. In one embodiment, a beam splitter splits the pulsed output laser beam into a plurality of laser beams.
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