Methods for determining a progressive ophthalmic lens are described, the lens comprising a near and a far vision area, a main meridian separating the lens into a nasal and a temporal area. The method includes determining a first and a second surface of the lens, determining the second surface to provide, in combination with the first surface, vision correcting properties, and determining a spherical area on the first surface of the lens having a constant sphere value and including a far vision diopter measurement position. The far vision diopter measurement position and a near vision diopter measurement position have substantially the same mean sphere value. The method also includes determining the first surface to reduce the lens distortion by defining a toric area extending outside the spherical area on the first surface in at least one of the nasal and the temporal area, in which characteristics of the toric area are related to the lens astigmatism.

The invention relates to a method for determining at least an optical feature of an ophthalmic lens to be placed in a frame for vision correction of a subject, comprising: a) measuring (100) a value of a fitting parameter linked to the subject and/or the frame or a value of a dioptric parameter of the subject, thanks to a measurement process, b) providing (200) a level of uncertainty of said value measured in step a) depending on said measurement process, c) determining (400; 510; 620; 640) said optical feature of said ophthalmic lens by taking into account said value measured in step a) and said level of uncertainty provided in step b).

A method of making an intraocular lens. The method including forming an anterior surface and an opposing posterior surface, the surfaces being disposed about an optical axis and providing an optic having a clear aperture. The method further including forming a central zone comprising a plurality of optical powers that progressively vary between a first optical power at a center of the central zone and a second optical power at a periphery of the central zone, the absolute value of the difference between the first optical power and the second optical power being between about 0.25 Diopter and about 1 Diopter. The method including forming outer zone disposed about the central zone, the outer zone comprising a third optical power, the outer zone extending from the periphery of the central zone.