Contact lens and a method for manufacturing contact lens

G - Physics – 02 – C

Patent

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G02C 7/04 (2006.01) B24B 13/00 (2006.01)

Patent

CA 2161890

A contact lens (30) having a smooth surface (55, 65) is made through the use of a computer implementing a spline approxima- tion of corneal topography (145). Piecewise polynomials approximating the corneal to- pography (145) have equal first and second derivatives where they join. A curve (50) representing the central optical portion of the lens and the piecewise polynomial (70) adjacent to the central optical portion curve (50) have an equal first derivative where they join. A contact lens (30) is cut cor- responding to the smooth surface (55, 65) defined by the piecewise polynomials.

Une lentille de contact (30) ayant une surface lisse (55, 65) est réalisée à l'aide d'un ordinateur en utilisant une approximation spline de la topographie de la cornée (145). Les dérivées première et seconde des fonctions polynomiales par morceaux représentant approximativement la topographie de la cornée (145) sont égales aux points où les courbes se rejoignent. La courbe (50) représentant la portion optique centrale de la lentille et le morceau de fonction polynomiale (70) adjacent à la portion de courbe optique centrale (50) ont la même dérivée première au point où elles se rejoignent. Une lentille de contact (30) est découpée pour correspondre à la surface lisse (55, 65) décrite par les fonctions polynomiales par morceaux.

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