Surgery – Instruments – Light application
Patent
1991-05-31
1993-05-04
Shay, David M.
Surgery
Instruments
Light application
606 10, 606 12, A61B 506
Patent
active
052076687
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
patent: 4793330 (1990-11-01), Azema et al.
"Excimer Laser Surgery of the Cornea", by Trokel et al; Am. J. Ophthalmology; vol. 96, Dec. 1983, pp. 710-715.
"In vivo Experiments with the Excimer Laser Technical Parameters & Healing Processes", by Seiler et al; Ophthalmologica, Basel, vol. 192, pp. 65-70 (1986).
"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 Corneal Microsurgery Volume 2 Corneal Surgery" by Gerard; The C. W. Mosley Co., St. Louis 1981.
Shay David M.
VISX Incorporated
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