Method and apparatus for improving vision

A - Human Necessities – 61 – F

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A61F 9/007 (2006.01) A61F 9/013 (2006.01)

Patent

CA 2236795

Methods and apparatus are disclosed for causing the optical center of the eye to align "HIGH point" of the anterior surface of the cornea. In accordance with one aspect of the invention relating to corneal ablation procedures, the "HIGH point" ( 14) of the eye is used as the pole of a spherical surface which is fitted approximately to a portion of the anterior surface of the cornea within a "bounded region" (16). For corneal ablation procedures, the "bounded region" comprises a generally inverted cup shaped region of the anterior surface of the eye bounded at its periphery by a plane (BP) which is substantially perpendicular to a local z-axis. During the operation local high points which project above the spherical surface are ablated. According to another aspect of the invention relating to radial keratotomy procedures, a pair of incisions (b, b') in the plane of a "great circle" are formed in the cornea to weaken and flatten it. As used herein, a "great circle" is formed by a plane containing the "HIGH point" and parallel to the local z-axis. The "bounded region" for radial keratotomy procedures is defined absolutely in terms of a circle projected onto the corneal surface which is centered about an axis passing through the "HIGH point" and parallel to the z-axis.

L'invention concerne des procédés et un appareil destinés à amener le centre optique de l'oeil à aligner un "point HAUT" de la surface antérieure de la cornée. Selon un aspect de l'invention relatif à des opérations d'ablation de la cornée, le "point HAUT" (14) de l'oeil est utilisé comme pôle d'une surface sphérique, laquelle est adaptée approximativement à une partie de la surface antérieure de la cornée, à l'intérieur d'une "region délimitée" (16). Pour des opérations d'ablation de la cornée, la "region délimitée" comprend une région de forme évasée inversée de la surface antérieure de l'oeil délimitée au niveau de sa périphérie par un plan (BP) sensiblement perpendiculaire à l'axe z local. Pendant l'opération, on pratique l'ablation des points hauts locaux se projetant au-dessus de la surface sphérique. Selon un autre aspect de l'invention relatif à des opérations de kératotomie radiale, on pratique une paire d'incisions (b, b') dans le plan d'un "grand cercle" dans la cornée afin de l'affaiblir et de l'applanir. Tel qu'on l'utilise dans l'invention, un "grand cercle" est formé par un plan contenant le "point HAUT" et parallèle à l'axe z local. La "region délimitée" destinée à une opération de kératotomie radiale est définie dans l'absolu en termes d'un cercle projeté sur la surface de la cornée, lequel est centré autour d'un axe passant par le "point HAUT" et parallèle à l'axe z.

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