A method implemented by computer means, for providing a set of data of a pair of ophthalmic lenses for spectacles adapted to a future wearer of said spectacles and a frame chosen by the wearer, wherein the method comprises the steps of: - inputting in a computer system a first set of data related to the wearer, said first set of data comprising at least a prescription of said wearer, - inputting in said computer system a second set of data related to said spectacle frame chosen by the wearer, and wherein said computer system is provided with processing means for outputting, on the basis of said first and second sets of data, said set of data characterizing a pair of ophthalmic lenses adapted to said wearer and said frame, selected among a plurality of sets of data (S1, S2,...SN) in which each set of data (Si) characterizes a pair of ophthalmic lenses adapted to said wearer and said frame in accordance with optical quality constraints that are released in order to obtain more than one single choice of possible bases suiting the prescription of said wearer and the frame chosen by the wearer, and wherein at least two criteria are inputted both in said computer system with respective weights, and wherein said processing means are arranged for selecting said at least one set of data relative to a pair of lenses best suiting said at least two criteria taking into consideration their respective weights, amongst said plurality of sets of data (S1, S2,...SN) relative to possible pairs of lenses, said at least two criteria being selected amongst: - a comfort provided by said lenses, - an aesthetics of spectacles provided with said lenses, - a price of said lenses. wherein the method comprises the steps of: - inputting in a computer system a first set of data related to the wearer, said first set of data comprising at least a prescription of said wearer, - inputting in said computer system a second set of data related to said spectacle frame chosen by the wearer, - inputting in a computer system a first set of data related to the wearer, said first set of data comprising at least a prescription of said wearer, - inputting in said computer system a second set of data related to said spectacle frame chosen by the wearer, and wherein said computer system is provided with processing means for outputting, on the basis of said first and second sets of data, said set of data characterizing a pair of ophthalmic lenses adapted to said wearer and said frame, selected among a plurality of sets of data (S1, S2,...SN) in which each set of data (Si) characterizes a pair of ophthalmic lenses adapted to said wearer and said frame in accordance with optical quality constraints that are released in order to obtain more than one single choice of possible bases suiting the prescription of said wearer and the frame chosen by the wearer, and wherein at least two criteria are inputted both in said computer system with respective weights, and wherein said processing means are arranged for selecting said at least one set of data relative to a pair of lenses best suiting said at least two criteria taking into consideration their respective weights, amongst said plurality of sets of data (S1, S2,...SN) relative to possible pairs of lenses, said at least two criteria being selected amongst: - a comfort provided by said lenses, - an aesthetics of spectacles provided with said lenses, - a price of said lenses. - a comfort provided by said lenses, - an aesthetics of spectacles provided with said lenses, - a price of said lenses.