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The Lri L.P. patent solves the following problem:
The invention relates to the part of ophthalmological surgery concerned with operations on the outer surface of the cornea.
Our analysis of this patent is as follows:
Lri L.P.’s patent US 4665913 A deals with Method for ophthalmological surgery.
invention contemplates the 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 so controlled as to achieve the desired depth of ablation, which is a local step in carving, and the scanning action coordination to achieve the desired completely change the face of the cornea. scanning can be controlled so as to change the face of the cornea from a greater to a low circular curvature, or from a low to a greater circle curvature , thus effecting a reduction myopic or hyperopic conditions, without resort to a contact or other corrective auxiliary lens technique, in which the cornea becomes corrective lens. scanning can also be controlled so as to reduce astigmatism and make the appropriate incisions in a keratotomy. Still further, the scanning can be controlled so as to excise corneal tissue uniformly on a proper control of the cornea proper accommodation in a corneal transplant.
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