Optimization and production of an eyeglass lens for correcting an astigmatic refraction

A method for producing a spectacle lens pair for a specific situation of wear for correcting a first astigmatic refraction of a first eye of a wearer and a second astigmatic refraction of a second eye of the wearer, in which a reference direction of sight −ez(1) of the first eye has a first cylinder reference axis α0(1) and a reference direction of sight −ez(2) of the second eye has a second cylinder reference axis α0(2), the method comprising:

• determining a primary direction of sight −eζ(1,p) of the first eye for at least one primary evaluation point ib(1,p) of a first spectacle lens of the pair;
• determining a primary direction of sight −eζ,k(2,p) of a second eye of the wearer that corresponds to the primary direction of sight −eζ(1,p) of the first eye in the specific situation of wear;
• and
• minimizing a first primary merit function to produce at least one surface of the first spectacle lens, wherein the first primary merit function for the at least one primary evaluation point ib(1,p) of the first spectacle lens takes into account a correction of a first primary transformed astigmatic refraction by the first spectacle lens in the specific situation of wear such that the first primary transformed astigmatic refraction depends on the corresponding primary direction of sight −eζ,k(2,p) of the second eye;
• and
• producing a second spectacle lens of the pair based on the first spectacle lens.

A non-transitory computer program product including program parts, which, when loaded and executed on a computer, are configured to perform a method for producing a first spectacle lens for a specific situation of wear for correcting at least a first astigmatic refraction of a first eye of a wearer, which has a first cylinder reference axis α0(1) in a reference direction of sight −ez(1) of the first eye, the method comprises:

• determining a primary direction of sight −eζ(1,p) of the first eye for at least one primary evaluation point ib(1,p) of the first spectacle lens;
• determining a primary direction of sight −eζ,k(2,p) of a second eye of the wearer that corresponds to the primary direction of sight −eζ(1,p) of the first eye in the specific situation of wear;
• and
• minimizing a first primary merit function to produce at least one surface of the first spectacle lens, wherein the first primary merit function for the at least one primary evaluation point ib(1,p) of the first spectacle lens takes into account a correction of a first primary transformed astigmatic refraction by the first spectacle lens in the specific situation of wear such that the first primary transformed astigmatic refraction depends on the corresponding primary direction of sight −eζ,k(2,p) of the second eye.

A non-transitory storage medium with a computer program stored thereon, said computer program being adapted, when loaded and executed on a computer, to perform a method for producing a first spectacle lens for a specific situation of wear for correcting at least a first astigmatic refraction of a first eye of a wearer, which has a first cylinder reference axis α0(1) in a reference direction of sight −ez(1) of the first eye, the method comprises:

• determining a primary direction of sight −eζ(1,p) of the first eye for at least one primary evaluation point ib(1,p) of the first spectacle lens;
• determining a primary direction of sight −eζ,k(2,p) of a second eye of the spectacle wearer that corresponds to the primary direction of sight −eζ(1,p) of the first eye in the specific situation of wear;
• and
• minimizing a first primary merit function to produce at least one surface of the first spectacle lens, wherein the first primary merit function for the at least one primary evaluation point ib(1,p) of the first spectacle lens takes into account a correction of a first primary transformed astigmatic refraction by the first spectacle lens in the specific situation of wear such that the first primary transformed astigmatic refraction depends on the corresponding primary direction of sight −eζ,k(2,p) of the second eye.

An apparatus for producing at least a first spectacle lens, the apparatus comprises:

• measuring unit configured to measure merit data of a first spectacle lens;
• calculation unit for calculating a first spectacle lens for a specific situation of wear for correcting at least a first astigmatic refraction of a first eye of a wearer, which has a first cylinder reference axis α0(1) in a reference direction of sight −ez(1) of the first eye, wherein the calculation units is configured to:
• determine a primary direction of sight −eζ(1,p) of the first eye for at least one primary evaluation point ib(1,p) of the first spectacle lens;
• determine a primary direction of sight −eζ,k(2,p) of a second eye of the spectacle wearer that corresponds to the primary direction of sight −eζ(1,p) of the first eye in the specific situation of wear;
• and
• minimize a first primary merit function to produce at least one surface of the first spectacle lens, wherein the first primary merit function for the at least one primary evaluation point ib(1,p) of the first spectacle lens takes into account a correction of a first primary transformed astigmatic refraction by the first spectacle lens in the specific situation of wear such that the first primary transformed astigmatic refraction depends on the corresponding primary direction of sight −eζ,k(2,p) of the second eye.