Method of laser-sculpture of the optically used portion of the cornea
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United States of America Patent
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Sep 27, 1988
Issued Date -
N/A
app pub date -
Jun 8, 1987
filing date -
Nov 17, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention contemplates removal of epithelium-layer material from the anterior surface of the cornea, as a step preparatory to laser surgery, wherein controlled ultraviolet irradiation of the cornea is operative to surgically ablate corneal tissue within an epithelium-free area which is in the optically used central region of the cornea; the control is such (1) as first to effect essentially uniform-depth removal of Bowman's membrane to the extent of exposing only stroma tissue within said central region, and then (2) to so selectively distribute the ultraviolet radiation to then-exposed stroma tissue as to effect in stroma tissue a predetermined sculpted corrective-curvature change in the optically used region. Other important pre-surgury and post-surgery procedural steps are disclosed, for greater assurance of a predictable curvature change through the sculpting laser surgery.
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