Method for obtaining data representative of the outline of a shoulder delimiting a step-back portion to be machined in a pre-wearer-selected-eyeglass for becoming a wearer-selected-eyeglass comprising said shoulder between said step-back portion and an operational portion, including: a) the step of providing spectacles including: an eyeglass frame having a first arc, a second arc and a bridge connecting said first arc and said second arc; a first template eyeglass (15; 115) having a mounting portion inserted in a groove of said first arc and an operational portion projecting from the first arc; and a second template eyeglass having a mounting portion inserted in a groove of said second arc and an operational portion projecting from the second arc; b) the step of selecting the first template eyeglass (15; 115) as to be replaced by said wearer-selected-eyeglass and the step of selecting accordingly said pre-wearer-selected eyeglass so that it can be machined for said wearer-selected eyeglass to have said step-back portion with the same conformation as the mounting portion of the first template eyeglass (15; 115); wherein said method further includes: c) the step of providing an eyeglass outline editor including a user interface for providing an eyeglass visualization and for entering point locations on said eyeglass visualization, said editor being configured for outputting data representative of an edited outline on the basis of the point locations entered on said eyeglass visualization; d) the step of providing a set of visible marks on said first template eyeglass (15; 115) independently of the first arc, said visible marks being distributed along at least one direction; e) the step of obtaining image data of said first template eyeglass (15; 115) provided with said visible marks and the step of having said outline editor providing on the basis of said image data a visualization of said first template eyeglass (15; 115) provided with said visible marks; f) the step of determining through observation of said spectacles the location - with respect to the visible marks - of points of the first arc from which the template eyeglass (15; 115) projects; g) the step of using said interface of said eyeglass outline editor for entering on said provided visualization the so determined locations - with respect to the visible marks - of said points of the first arc; and h) the step of outputting from said editor said data representative of said edited outline on the basis of the point locations so entered on said provided visualization, whereby said edited outline is said outline of said shoulder. a) the step of providing spectacles including: an eyeglass frame having a first arc, a second arc and a bridge connecting said first arc and said second arc; a first template eyeglass (15; 115) having a mounting portion inserted in a groove of said first arc and an operational portion projecting from the first arc; and a second template eyeglass having a mounting portion inserted in a groove of said second arc and an operational portion projecting from the second arc; b) the step of selecting the first template eyeglass (15; 115) as to be replaced by said wearer-selected-eyeglass and the step of selecting accordingly said pre-wearer-selected eyeglass so that it can be machined for said wearer-selected eyeglass to have said step-back portion with the same conformation as the mounting portion of the first template eyeglass (15; 115); c) the step of providing an eyeglass outline editor including a user interface for providing an eyeglass visualization and for entering point locations on said eyeglass visualization, said editor being configured for outputting data representative of an edited outline on the basis of the point locations entered on said eyeglass visualization; d) the step of providing a set of visible marks on said first template eyeglass (15; 115) independently of the first arc, said visible marks being distributed along at least one direction; e) the step of obtaining image data of said first template eyeglass (15; 115) provided with said visible marks and the step of having said outline editor providing on the basis of said image data a visualization of said first template eyeglass (15; 115) provided with said visible marks; f) the step of determining through observation of said spectacles the location - with respect to the visible marks - of points of the first arc from which the template eyeglass (15; 115) projects; g) the step of using said interface of said eyeglass outline editor for entering on said provided visualization the so determined locations - with respect to the visible marks - of said points of the first arc; and h) the step of outputting from said editor said data representative of said edited outline on the basis of the point locations so entered on said provided visualization, whereby said edited outline is said outline of said shoulder.