Ophthalmic method for laser surgery of the cornea
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United States of America Patent
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Apr 16, 1996
Issued Date -
N/A
app pub date -
Jan 20, 1988
filing date -
Nov 17, 1983
priority date (Note) -
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Abstract
The invention contemplates an inventory of disposable elements adapted for selective placement in the path of laser-beam delivery to the cornea. Each of the disposable elements carries a membrane which is opaque to the laser beam and which is designedly subject to ablation when exposed to the laser beam, the thickness of the membrane being a precharacterized function of local area such that a given laser-beam course of exposure will require greater or lesser time to locally ablate the membrane and thus permit laser-beam exposure past the membrane and into correspondingly localized ablating impingement with the cornea. Stated in other words, varying-spot size at the cornea is achieved by a time-release function of the membrane, on a predetermined area-controlled basis that is designed to achieve the diopter change specifically identified with each particular selectable element.
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