A method, implemented by computer means, for supplying a spectacle lens adapted to a spectacle frame selected by a wearer, said method involving steps of: - Selecting a spectacle frame by the wearer, at a picture capturing side, the spectacle frame comprising two half-frames each having a center and two trial lenses and with a barcode tag placed beforehand on one trial lens of the selected frame so as to be apparent when a picture is captured and comprising a data storage capacity enabling to store information necessary for describing the three dimensional shape of the selected frame, wherein said barcode is written with an invisible ink which becomes apparent in visible spectrum when illuminated with infra-red or ultraviolet light; - Illuminating the wearer wearing the selected spectacle frame with an infra-red or ultraviolet light; - Capturing with a camera at least one picture showing at least partially a face of said wearer wearing the selected spectacle frame, at said picture capturing side so as a position of said spectacle frame with respect to the wearer face is extractable from said at least one picture, wherein the camera is configured to retrieve the details of the tag; - Obtaining (S3.1) a three dimensional shape of the selected frame at a picture processing side, by numerical image processing and reading data comprised in the barcode tag in the captured picture, the three dimensional shape providing a length reference; - Numerical processing of said at least one picture captured with the camera and using the length reference for obtaining the position of said spectacle frame with respect to the wearer face, at said picture processing side, where the said position comprises the horizontal or the vertical distance between the center of each half-frame and the center of the pupil, and - Ordering to a lens manufacturing side the spectacle lens complying with said frame shape, said extracted frame position, and wearer data, wherein said wearer data comprises at least a prescription for the wearer. - Selecting a spectacle frame by the wearer, at a picture capturing side, the spectacle frame comprising two half-frames each having a center and two trial lenses and with a barcode tag placed beforehand on one trial lens of the selected frame so as to be apparent when a picture is captured and comprising a data storage capacity enabling to store information necessary for describing the three dimensional shape of the selected frame, wherein said barcode is written with an invisible ink which becomes apparent in visible spectrum when illuminated with infra-red or ultraviolet light; - Illuminating the wearer wearing the selected spectacle frame with an infra-red or ultraviolet light; - Capturing with a camera at least one picture showing at least partially a face of said wearer wearing the selected spectacle frame, at said picture capturing side so as a position of said spectacle frame with respect to the wearer face is extractable from said at least one picture, wherein the camera is configured to retrieve the details of the tag; - Obtaining (S3.1) a three dimensional shape of the selected frame at a picture processing side, by numerical image processing and reading data comprised in the barcode tag in the captured picture, the three dimensional shape providing a length reference; - Numerical processing of said at least one picture captured with the camera and using the length reference for obtaining the position of said spectacle frame with respect to the wearer face, at said picture processing side, where the said position comprises the horizontal or the vertical distance between the center of each half-frame and the center of the pupil, and - Ordering to a lens manufacturing side the spectacle lens complying with said frame shape, said extracted frame position, and wearer data, wherein said wearer data comprises at least a prescription for the wearer.