A method of calculating an optical system (OS) of an ophthalmic lens comprising a light-guide optical element according to a given spectacle frame in the view of using the calculated optical system for manufacturing said ophthalmic lens comprising said light-guide optical element, said ophthalmic lens comprising a back surface (BS) and a front surface (FS) arranged to deliver an ophthalmic vision image (OV), where the back surface is positioned closest to a wearer's eye when the ophthalmic lens is worn, said light-guide optical element having a proximal surface (PS) and a distal surface (DS), said light-guide optical element being arranged to output a supplementary image (SI) to the wearer through an exit surface (ES) located on the proximal surface (PS), the optical system being designed to provide two visions - ophthalmic and supplementary - to the wearer, the two visions being available simultaneously or alternately, whereby the ophthalmic image remains visible or not while the supplementary vision is presented to the wearer, the light-guide optical element being embedded in said ophthalmic lens between the front and the back surface, wherein the method comprises the steps of: • providing design optical data, wherein the design optical data is the set of parameters allowing to define an optical function of the optical system (OS); • providing at least a morpho-geometrical parameter data of the frame or of the light-guide optical element; • providing an initial position of the light-guide optical element; • optimizing the optical system (OS) according to at least the morpho-geometrical parameter data as a target, wherein the front surface (FS) and/or the back surface (BS) of the optical system (OS) is also (are) optimized according to said design optical data as a target; and wherein the morpho-geometrical parameter of the spectacle frame and/or of the light-guide optical element is chosen in the list consisting of the pantoscopic angle of the frame; the face form angle of the frame; the base curve of the frame and the contour of the frame; the pantoscopic angle of the light-guide optical element, and wherein the optical system (OS) is optimized also by tilting the initial position of the light-guide optical element. • providing design optical data, wherein the design optical data is the set of parameters allowing to define an optical function of the optical system (OS); • providing at least a morpho-geometrical parameter data of the frame or of the light-guide optical element; • providing an initial position of the light-guide optical element; • optimizing the optical system (OS) according to at least the morpho-geometrical parameter data as a target, wherein the front surface (FS) and/or the back surface (BS) of the optical system (OS) is also (are) optimized according to said design optical data as a target; and wherein the morpho-geometrical parameter of the spectacle frame and/or of the light-guide optical element is chosen in the list consisting of the pantoscopic angle of the frame; the face form angle of the frame; the base curve of the frame and the contour of the frame; the pantoscopic angle of the light-guide optical element, and wherein the optical system (OS) is optimized also by tilting the initial position of the light-guide optical element. <EOS>