Systems and methods for determining intraocular lens power

Details Systems and methods for determining intraocular lens power Systems and methods for determining intraocular lens power

A - Human Necessities

61

F

A61F 2/16 (2006.01) A61B 3/10 (2006.01)

Patent

CA 2725508

A system for providing an intraocular lens includes a processor and a computer readable memory. The computer readable memory is configured to communicate with the processor, the memory having stored therein at least one of: one or more ocular dimensions, and at least one predetermined refractive outcome. The memory further includes a sequence of instructions which, when executed by the processor, cause the processor to select an intraocular lens, select a power of an intraocular lens, or provide an intraocular lens. The sequence of instructions includes determining one or more dimensions of an eye. The instructions also include calculating, based on a mathematical relationship, a distance from an apex of a cornea of the eye to an apex or plane of the intraocular lens after insertion into the eye. The instructions further calculating an optical power of the intraocular lens suitable for providing a predetermined refractive outcome. The mathematical relationship includes an axial length of the eye, an anterior chamber depth of the natural crystalline lens, and a corneal radius of the eye, but is independent of a thickness of the natural crystalline lens.

L'invention porte sur un système d'élaboration d'une lentille intraoculaire comprenant un processeur et une mémoire lisible par ordinateur. Ladite mémoire, qui communique avec le processeur, contient au moins une ou plusieurs dimensions oculaires et au moins un ou plusieurs coefficients de réfraction résultants prédéterminés. Ladite mémoire contient en outre une suite d'instructions qui, exécutées par le processeur, l'amènent: à sélectionner une lentille intraoculaire; à sélectionner la puissance d'une lentille intraoculaire ou à fournir une lentille intraoculaire; et lui permettent: de déterminer une ou plusieurs des dimensions de l'oeil; de calculer sur la base d'une relation mathématique la distance séparant l'apex de la cornée de l'apex ou du plan de la lentille intraoculaire, après son insertion dans l'oeil; et de calculer la puissance optique d'une lentille intraoculaire présentant un coefficient de réfraction résultant prédéterminés. Ladite relation mathématique comporte la longueur axiale de l'oeil, la profondeur de la chambre antérieure du cristallin naturel et le rayon de la cornée, cela indépendamment de l'épaisseur du cristallin naturel.

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