Method of selecting a semi-finished ophthalmic lens according to a given spectacle frame
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsFrédéric Dubois, Cécile Pietri, Pauline Colas, David Freson
Life of this patent
Estimating the term…
Abstract
A method of selecting a semi-finished ophthalmic lens according to a given spectacle frame comprising the steps of: providing the spectacle frame front face base data providing a list of semi-finished ophthalmic lenses with a plurality of front face bases, and selecting from the list of semi-finished ophthalmic lenses the semi-finished ophthalmic lens whose front base is the closest from the front base of the spectacle frame.
Claims24
A method of selecting a semi-finished ophthalmic lens according to a given spectacle frame comprising the steps of:
- providing, at a processor, the spectacle frame front face base data;
- providing, at the processor, a list of semi-finished ophthalmic lenses with a plurality of front face bases;
- and
- selecting, by the processor, from the list of semi-finished ophthalmic lenses a semi-finished ophthalmic lens whose front base is the closest to the front base of the spectacle frame, wherein the semi-finished lens is selected such that the average curvature of the front face of the semi-finished lens, differs by less than 0.5 Diopter from the average curvature of the front face of the spectacle frame, with the average curvature of the front face of the semi-finished lens and the average curvature of the front face of the spectacle frame both being expressed in terms of Diopters for an index of refraction of 1.53.
A computer program stored on a computer memory and executing on a processor which, when used on a computer apparatus causes the processor to execute a method of selecting a semi-finished ophthalmic lens according to a given spectacle frame, the method comprising the steps of
- providing the spectacle frame front face base data;
- providing a list of semi-finished ophthalmic lenses with a plurality of front face bases;
- and
- selecting from the list of semi-finished ophthalmic lenses a semi-finished ophthalmic lens whose front base is the closest to the front base of the spectacle frame, wherein the semi-finished lens is selected such that the average curvature of the front face of the semi-finished lens differs by less than 0.5 Diopter from the average curvature of the front face of the spectacle frame, with the average curvature of the front face of the semi-finished lens and the average curvature of the front face of the spectacle frame both being expressed in terms of Diopters for an index of refraction of 1.53.
A non-transitory computer readable medium storing a computer program which when executed by a processor on a computer apparatus causes the processor to execute a method of selecting a semi-finished ophthalmic lens according to a given spectacle frame, the method comprising the steps of:
- providing the spectacle frame front face base data;
- providing a list of semi-finished ophthalmic lenses with a plurality of front face bases;
- and
- selecting from the list of semi-finished ophthalmic lenses a semi-finished ophthalmic lens whose front base is the closest to the front base of the spectacle frame, wherein the semi-finished lens is selected such that the average curvature of the front face of the semi-finished lens differs by less than 0.5 Diopter from the average curvature of the front face of the spectacle frame, with the average curvature of the front face of the semi-finished lens and the average curvature of the front face of the spectacle frame both being expressed in terms of Diopters for an index of refraction of 1.53.
Dependencies are inferred from the claim text.