A method for providing an optical system adapted to a user, the optical system comprising at least an optical lens and a see-through displaying device, the method comprises at least: - an optical lens providing step, during which the optical lens being an active optical lens having a programmable optical function controlled by an optical function controller is provided, the optical lens being designed to be placed in front of an eye of the user and comprising at least a back face having an optical design and a front face, opposed to the back face, having another optical design, the optical design comprises a set of parameters allowing to define a dioptric function of an ophthalmic lens; - a see-through displaying device providing step; during which a see-through displaying device is provided, the see-through displaying device being designed and configured to display the virtual image towards the eye of the user, the virtual image being transmitted at least through the back face and the front face of the optical lens defining a display area on the back face; - a correcting optical function determining step, during which a correcting optical function to be applied on a virtual image to be displayed to the user of the optical system is determined; - an optical system adjusting step, during which the optical system is adjusted based on the determined correcting optical function, wherein determining the correcting optical function comprises: - an optical design data providing step, during which optical design data relating to the optical design of the front face and the back face of the optical lens are provided; - a display area data providing step, during which display area data relative to at least one parameter of the display area are provided; and - a correcting optical function determining step, during which a correcting optical function is determined based at least on the optical design data of the front face and the back face and on the display area data. - an optical lens providing step, during which the optical lens being an active optical lens having a programmable optical function controlled by an optical function controller is provided, the optical lens being designed to be placed in front of an eye of the user and comprising at least a back face having an optical design and a front face, opposed to the back face, having another optical design, the optical design comprises a set of parameters allowing to define a dioptric function of an ophthalmic lens; - a see-through displaying device providing step; during which a see-through displaying device is provided, the see-through displaying device being designed and configured to display the virtual image towards the eye of the user, the virtual image being transmitted at least through the back face and the front face of the optical lens defining a display area on the back face; - a correcting optical function determining step, during which a correcting optical function to be applied on a virtual image to be displayed to the user of the optical system is determined; - an optical system adjusting step, during which the optical system is adjusted based on the determined correcting optical function, - an optical design data providing step, during which optical design data relating to the optical design of the front face and the back face of the optical lens are provided; - a display area data providing step, during which display area data relative to at least one parameter of the display area are provided; and - a correcting optical function determining step, during which a correcting optical function is determined based at least on the optical design data of the front face and the back face and on the display area data.