Process for fitting a contact lens, and measuring lens for...

G - Physics – 02 – C

Patent

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G02C 7/06 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2234861

In a process for fitting a contact lens to a human eye, the geometry of the eyeball and the back surface geometry of the lens, and the required optical corrections for the distant and near vision of the eye to be corrected are determined. The measurement for fitting the contact lens takes place with a measuring lens that enables determination of relative pupil motion with respect to a reference system on or near the eye on changing from far vision to near vision. The measuring lens to be used for this measurement process has a substantially spherical lens body that has a substantially convex outer surface and a substantially concave inner surface. This measuring lens preferably serves for fitting multifocal contact lenses. To facilitate the measuring process, arrangements for determining the relative movement of a human pupil with respect to the surface of the measuring lens is provided on the measuring lens.

L'invention concerne un processus pour ajuster un verre de contact à l'oeil d'une personne, lequel processus consiste à déterminer la géométrie du globe oculaire et de la surface arrière du verre et les corrections optiques nécessaires pour la vision éloignée et rapprochée à corriger de l'oeil. Les mesures pour ajuster le verre de contact sont prises à l'aide d'une lentille de mesure qui permet de déterminer le mouvement relatif de la pupille par rapport à un système de référence sur l'oeil, ou près de ce dernier, au cours du changement de la vision éloignée à la vision rapprochée. La lentille de mesure à utiliser pour ce processus de mesure présente un corps essentiellement sphérique, ayant une surface externe essentiellement convexe et une surface interne essentiellement concave. De préférence, elle sert à l'ajustement de verres de contact à foyer progressif. Pour faciliter le processus de mesure, la lentille de mesure comprend des mécanismes pour déterminer le mouvement relatif de la pupille d'une personne relativement à la surface de la lentille de mesure.

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