Progressive spectacle lens, method of manufacturing a progressive spectacle lens, and method of designing a progressive spectacle lens

A method of manufacturing a progressive spectacle lens configured to be worn by a specific wearer in a specific as-worn position, the method comprising:

• obtaining or providing the specific as-worn position for the wearer;
• obtaining or providing a refractive power for a distance vision of the wearer;
• obtaining or providing a refractive power for a near vision of the wearer;
• providing a lens blank;
• and
• configuring the lens blank based on the specific as-worn position for the wearer,
• the refractive power for distance vision, and the refractive power for near vision by forming at least one free-form surface on the front surface or the rear surface of the lens blank, the at least one free-form surface including:
• an upper viewing zone having a distance reference point, the upper viewing zone providing, in the specific as-worn position, a first refractive power configured for distance vision;
• a lower viewing zone with a near reference point, the lower viewing zone providing in the specific as-worn position a second refractive power, configured for near vision,
• a corridor between the upper viewing zone and the lower viewing zone;
• a left peripheral zone and a right peripheral zone that are separated by the corridor and the lower viewing zone;
• and
• a first low mean power zone located in the upper viewing zone and at least one of a second low mean power zone located in the left peripheral zone or a third low mean power zone located in the right peripheral zone, wherein a mean refractive power experienced by a wearer in the specific as-worn position does not exceed the first refractive power plus 0.125 D in the first, second, and third low mean power zones;
• and
• forming the low mean power zones of the at least one free-form surface to occupy at least 40% of an area of the progressive spectacle lens.

A computer implemented method of designing a progressive spectacle lens configured to be worn by a specific wearer in a specific as-worn position, the spectacle lens having a front surface and a back surface, the method comprising:

• obtaining or providing the specific as-worn position for the wearer;
• obtaining or providing a first refractive power for distance vision of the wearer;
• obtaining or providing a second refractive power for near vision of the wearer;
• providing a target lens design by defining:
• a refractive power distribution of the progressive spectacle lens including the first refractive power for distance vision and the second refractive power for near vision;
• an upper viewing zone having a distance reference point, the upper viewing zone providing the first refractive power adapted to the distance vision;
• a lower viewing zone having a near reference point, the lower viewing zone providing the second refractive power adapted to the near vision, the second refractive power providing an addition power relative to the first refractive power;
• a corridor arranged between the upper viewing zone and the lower viewing zone in which a refractive power gradually changes from the first refractive power to the second refractive power;
• and
• a left peripheral zone and a right peripheral zone, which are separated by the corridor and the lower viewing zone;
• a first low mean power zone arranged in the upper viewing zone, a second low mean power zone arranged in the left peripheral zone, and a third low mean power zone arranged in the right peripheral zone, the first, second, and third low mean power zones providing a mean refractive power to the wearer in the specific as-worn position that does not exceed the first refractive power plus 0.125 D;
• arranging the first, second, and third low mean power zones to occupy at least 40% of the area of the progressive spectacle lens;
• and
• optimizing a shape of at least one of the front surface or the back surface in the specific as-worn position based on the target lens design.