Production of a novel progressive glasses lens

Method of producing a new progressive spectacle eyeglass intended for a longsighted wearer, the method comprising the following steps:

• /1/ obtaining a characterisation of a reference eyeglass that is compatible with an ophthalmic prescription drawn up for the wearer, said reference eyeglass having a design corresponding to a reference value (Pref) of at least one postural parameter, said postural parameter having variable values for distinct observation positions adopted by the wearer;
• /2/ when the wearer is under ophthalmic correction conditions that were usual before the new progressive eyeglass is produced, measuring values (Pmes) of said postural parameter for said wearer during successive placements in observation position;
• /3/ calculating a mean Pmean and a standard deviation SD of the values (Pmes) measured in step /2/, and a corrected mean Pcorr for said values measured in accordance with the formula:
• Pcorr=Pmean−(Pmean−Pref)×SD/K
• Pref designating the reference value of the postural parameter and K being a non-zero constant;
• /4/ depending on the corrected mean Pcorr calculated in step /3/, determining a design for the new progressive eyeglass;
• and
• /5/ producing the new progressive eyeglass from the characterisation of the reference eyeglass, in accordance with the ophthalmic prescription and the design determined in step /4/;
• method wherein the reference value Pref of the postural parameter and the constant K are respectively a mean value and a standard deviation of values of the postural parameter determined for a population sample.