Computer-implemented method for providing a finished single vision ophthalmic lens

A computer-implemented method for determining a series of finished ophthalmic lenses having a rotationally symmetrical front surface, wherein said method comprises:

• (i) setting a range of values of prescription data of said finished ophthalmic lenses of said series;
• (ii) splitting said range into a predetermined number of subdomains of values of prescription data;
• (iii) for each of said subdomains, providing a subseries of finished ophthalmic lenses of said series, by:
• (iii1) defining a base value representative of a surface curvature at the optical center of a front surface of a finished ophthalmic lens of said subseries, according to optical and/or geometrical requirements;
• (iii2) selecting prescription data representative of said subdomain;
• (iii3) providing said subseries by:
• (iii3.1) defining targeted optical or geometrical characteristics of a target lens along a predetermined path on saida target lens, based on said prescription data representative of said subdomain, said target lens having at least one complex surface, wherein the complex surface is a surface having no central or axial symmetry;
• (iii3.2) selecting an initial lens different from said target lens complying with said prescription data representative of said subdomain and having a rotationally symmetrical front surface and a predetermined surface curvature at a prescription reference point;
• (iii3.3) defining a current lens as said initial lens;
• (iii3.4) modifying a front surface definition of said current lens to reach said targeted optical or geometrical characteristics of said target lens until an ending criterion is met;
• (iii3.5) providing a finished ophthalmic lens of said subseries as said current lens;
• (iii3.6) providing said subseries of finished ophthalmic lenses as all having a same front surface consisting of said modified front surface meeting said ending criterion and different sphero-toric back surfaces respectively corresponding to all the prescription data of said subdomain;
• (iii4) checking that said subseries satisfies a predetermined performance criterion for all the prescription data of said subdomain;
• (iii5) returning to splitting step (ii) and modifying said subdomains if said predetermined performance criterion is not met for all the prescription data of said subdomain;
• (iv) determining said series as said subseries provided for all of said subdomains.

A finished single vision ophthalmic lens intended for a wearer, wherein said lens has a rotationally symmetrical front surface and a back surface from a target lens different from said finished single vision ophthalmic lens and having at least one complex surface, wherein the complex surface is a surface having no central or axial symmetry, the target lens being a target ophthalmic lens on the basis of which the finished single vision ophthalmic lens will be provided, said finished single vision ophthalmic lens being provided by:

• (a) providing, either wearer data including prescription data relating to an eye of said wearer, or theoretical data from a computer simulation including prescription data relating to a virtual eye;
• (b) defining targeted optical or geometrical characteristics of said target lens along a predetermined path on said target lens, based on said wearer data or on said theoretical data;
• (c) determining said finished single vision ophthalmic lens by:
• (c1) selecting an initial lens different from said target lens complying with said prescription data and having a rotationally symmetrical front surface and a predetermined curvature at a prescription reference point;
• (c2) defining a current lens as said initial lens;
• (c3) modifying a front surface definition of said current lens to reach said targeted optical or geometrical characteristics until an ending criterion is met;
• said finished single vision ophthalmic lens being the current lens that meets said ending criterion.

A non-transitory computer-readable medium on which is stored computer program comprising instructions that, when executed by a processor, cause said processor to provide a finished single vision ophthalmic lens intended for a wearer, from a target lens different from said finished single vision ophthalmic lens and having at least one complex surface, wherein the complex surface is a surface having no central or axial symmetry, the target lens being a target ophthalmic lens on the basis of which the finished single vision ophthalmic lens will be provided, said finished lens having a rotationally symmetrical front surface, by:

• (a) providing, either wearer data including prescription data relating to an eye of said wearer, or theoretical data from a computer simulation including prescription data relating to a virtual eye;
• (b) defining targeted optical or geometrical characteristics of said target lens along a predetermined path on said target lens, based on said wearer data or on said theoretical data;
• (c) determining said finished single vision ophthalmic lens by:
• (c1) selecting an initial lens different from said target lens complying with said prescription data and having a rotationally symmetrical front surface and a predetermined curvature at a prescription reference point;
• (c2) defining a current lens as said initial lens;
• (c3) modifying a front surface definition of said current lens to reach said targeted optical or geometrical characteristics of said target lens until an ending criterion is met;
• (d) providing said finished single vision ophthalmic lens as said current lens.