Ophthalmic method for laser surgery of the cornea

Details Ophthalmic method for laser surgery of the cornea Ophthalmic method for laser surgery of the cornea

1988-01-20

1996-04-16

Shay, David M.

Surgery

Instruments

Light application

606 2, 606 3, 21912169, 21912174, A61B 502

Patent

active

055077412

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.

REFERENCES:
patent: 4156124 (1979-05-01), Macken
patent: 4676790 (1987-06-01), Kern
patent: 4772283 (1988-09-01), White
patent: 4856513 (1989-08-01), Mullen

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