Method for opthalmological surgery

Details Method for opthalmological surgery Method for opthalmological surgery

1990-03-14

1993-02-23

Shay, David

Surgery

Instruments

Light application

606 13, 606 17, 606 18, 128395, A61N 506

Patent

active

051886316

ABSTRACT:
The invention contemplates controlled ablation of the cornea, using ultraviolet laser radiation, wherein irradiated flux density and exposure time are so controlled as to achieve desired depth of the ablation. Sculpturing action results from precharacterized distribution of flux density across the cross-section of laser-beam projection, in the context of beam size, at cornea incidence, to match the area to be ablated, and the duration of exposure determines the extent of curvature change. Illustrative techniques and situations are disclosed, for myopia correction, for hyperopia correction, and for astigmatism correction.

REFERENCES:
patent: 4156124 (1979-05-01), Macken et al.
patent: 4173980 (1979-11-01), Curtin
"The Potential of an Infrared Hydrogen Fluoride (HF) Laser (3.0 .mu.m) for Corneal Surgery" Seiler et al. Lasers in Ophthal vol. 1 No. 1 1986 pp. 49-60.
"Carbon Dioxide Laser Beam Control for Corneal Surgery" by Keates et al., Ophthalmic Surgery vol. 12 No. 2 Feb. 1981 pp. 117-122.
"Advanced Techniques in Ophthalmic Microsurgery vol. Two Corneal Surgery" by Girard; The C. V. Masby Co; St. Louis; 1982.
"Excimer Laser Surgery of the Cornea" Trokel et al.; Am. J. Ophthal 96:710-715.

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