SPECTACLE LENS, FAMILY OF SPECTACLE LENSES, METHOD FOR DESIGNING A FAMILY OF SPECTACLE LENSES AND METHOD FOR PRODUCING A SPECTACLE LENS

摘要

The invention relates to a family of spectacle lenses, in which each spectacle lens is designed to achieve a specified prescriptive spherical power from among a number of prescriptive spherical powers and a specified prescriptive astigmatic power from among a number of prescriptive astigmatic powers, and in which each spectacle lens has a specified rotationally symmetrical spectacle-lens front face and a specified atoric spectacle-lens rear face. In each spectacle lens of the family there is, in at least one principal section, such a deviation in the curvature from the circular form that, for a value for the distance between the vertex of the spectacle lens rear face and the pivot point of the eye, which lies in a range between 15 and 40 mm, at any point in a spectacle lens region within a radius of 25 mm about the geometrical centre of the spectacle lens, an upper limit of the total deviation RMS = Sqrt(SphAbw² - (ast Abw/2)²) of the power is not exceeded, wherein the upper limit of the total deviation is given by 0.25D – MIN[(0.05*Sph - 0.1*IZylI);0] and where Sph is the "sphere" value of the prescriptive spherical power, Zyl is the "cylinder" value of the prescriptive astigmatic power, which can have the value zero or a negative value, IZylI is the absolute value of the "cylinder" value, sphAbw is the deviation of the prescriptive spherical power of the spectacle lens from the spherical power actually achieved therewith, astAbw is the deviation of the prescriptive astigmatic power of the spectacle lens from the astigmatic power actually achieved therewith, and MIN is the minimum function. The invention further relates to a method for designing such a family of spectacle lenses, to a spectacle lens and to a method for producing a spectacle lens.