Prescription-dependent and individualization-dependent modification of the temporal peripheral nominal astigmatism and adaption of the object distance function to changed object distances for near and/or far vision

#Aspects of the present invention relate to a computer-implemented method for optimizing and producing a progressive spectacle lens, corresponding devices for optimizing and producing a progressive spectacle lens, corresponding computer program products and storage media, as well as to a use of a spectacle lens.

#An optimization of a progressive spectacle lens is usually performed by minimizing a target function in which required or target values for at least one optical parameter, e.g. astigmatism and/or refractive power, or required or target values for at least one aberration, e.g. astigmatic error and/or refractive error, of the progressive spectacle lens are taken into account. In the optimization process of the spectacle lens, the individual prescription values (sph, cyl, axis, add, prism, base), parameters of the individual position or arrangement of the spectacle lens in front of the spectacles wearer's eye (e.g. corneal vertex distance (CVD), face form angle (FFA), forward inclination or pantoscopic angle), as well as physiological parameters (e.g. pupillary distance) can be taken into account. The progressive spectacle lens can be optimized and calculated “online” as one-of-a-kind after receipt of order.

#Moreover, DE 10 2008 015 189, DE 10 2009 005 206, or DE 10 2009 005 214 suggest determining the target astigmatism distribution, on the basis of which the progressive spectacle lens is optimized, by means of a transformation of an existing or predetermined design (starting design, base design). For example, DE 10 2008 015 189 suggests calculating target astigmatism distributions for different additions by means of a transformation of a predetermined base or starting target astigmatism distribution, which has been specified for a predetermined base addition. DE 10 2009 005 206 and DE 10 2009 005 214 suggest creating target astigmatism distributions with different widths of the distance and/or near zone(s) from a predetermined target astigmatism distribution by means of manipulation of a predetermined base target astigmatism line. The methods described in DE 10 2008 015 189, DE 10 2009 005 206, or DE 10 2009 005 214 make it possible to simplify the method for optimizing and producing a progressive spectacle lens and making it more efficient and flexible.

#Further objects, features, and advantages of the present invention will become apparent from the following detailed description of exemplary and preferred embodiments of the present invention with reference to the drawings, which show:

#FIG. 1 starting target astigmatism distribution for an addition of 2.5 dpt;

#FIG. 2 target astigmatism distribution for an addition of 2.5 dpt with a scaling of the temporal astigmatism;

#On the abscissa of FIGS. 14A to 17D, the vertical coordinate y of the main line of sight is plotted in mm. On the ordinate of FIGS. 14 to 17, the reciprocal object distance (reciprocal object separation) is plotted in dpt. The coordinate system is the above-described coordinate system {u,y}.

#FIG. 1 shows the starting target astigmatism distribution based on a predetermined starting surface for an addition of 2.5 dpt. The maximum astigmatism for the periphery is 2.6 dpt. Based on the starting target astigmatism distribution, a spectacle lens with the following prescription values and parameters is to be calculated: sphere (sph)=−5.0 dpt; cylinder (cyl)=0.0 dpt; addition (add)=2.5 dpt; base curve (BC)=3.0 dpt; refractive index n=1.579. The spectacle lens is calculated in a wearing position with the parameters: corneal vertex distance (CVD)=13 mm; forward inclination (FI)=7°; interpupillary distance (ID)=64 mm; Y tilt angle=0°.

#In one example, a factor k=0.58 is determined depending on the prescription data of the spectacle lens (in particular the prescription astigmatism, the prescribed axis of the prescription astigmatism, and the prescribed addition) and the tilt angle of the spectacle lens (cf. equations (7) to (13)). The factor k=0.58 is multiplied by the maximum temporal astigmatism of the starting target astigmatism distribution. Subsequently, an interpolation of the target astigmatism values between the 0.5 dpt base target isoastigmatism line and the periphery of the spectacle lens is performed taking the maximum temporal astigmatism multiplied by the factor k into consideration. The interpolation is performed for the peripheral target astigmatism according to the truncated cone method described in DE 10 2009 005 206 or DE 10 2009 005 214.