A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
327/1.2
A61F 9/00 (2006.01) A61F 9/009 (2006.01) A61F 9/01 (2006.01) B23K 26/08 (2006.01) A61B 17/30 (2006.01) A61B 18/20 (2006.01) A61F 9/008 (2006.01)
Patent
CA 1243732
METHOD AND APPARATUS FOR OPHTHALMOLOGICAL SURGERY ABSTRACT OF THE DISCLOSURE The invention contemplates use of a scanning laser characterized by ultraviolet radiation to achieve controlled ablative photodecomposition of one or more selected regions of a cornea. Irradiated flux density and exposure time are so controlled as to achieve desired depth of the ablation, which is a local sculpturing step, and the scanning action is coordinated to achieve desired ultimate surface change in the cornea. The scanning may be so controlled as to change the front surface of the cornea from a greater to a lesser spherical curvature, or from a lesser to a greater spherical curvature, thus effecting reduction in a myopic or in a hyperopic condition, without resort to a contact or other corrective auxiliary lens technique, in that the cornea becomes the corrective lens. The scanning may also be so controlled as to reduce astigma- tism and to perform the precise incisions of a radial keratotomy. Still further, the scanning may be so con- trolled as to excise corneal tissue uniformly over a precisely controlled area of the cornea for precision accommodation of a corneal transplant.
464792
L'esperance Francis A.
Smart & Biggar
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