Appliance for visualizing a signature mark of a spectacle lens, having - a support for the spectacle lens, wherein the support comprises a first side and a second side opposite the first side; - an illumination appliance, arranged on the first side of the support for the spectacle lens, for guiding an illumination light beam onto the spectacle lens, arranged on the support, for identifying the signature mark; and - a reflector, arranged on the second side of the support and formed as a retroreflector; wherein the appliance comprises a visualization appliance arranged on the first side of the support for the spectacle lens and formed for receiving and visually displaying an observation light beam coming from the spectacle lens, wherein the visualization appliance is a mobile device having an image recording apparatus and an image displaying apparatus, in particular a smart phone or a tablet, characterized in that the illumination appliance is formed to lead the illumination light beam coming from an external light source onto the spectacle lens arranged on the support, wherein the visualization appliance is arranged detachably in a holder, wherein the appliance has a cable connection with the mobile device, in order to supply the appliance with electrical voltage from the mobile device, wherein the electrical voltage of the mobile device is used for operating an electric motor, in order to enable a movement of the reflector formed as a retroreflector, wherein a frequency of a periodic movement of the reflector formed as a retroreflector is matched to a synchronization signal of the visualization appliance. - a support for the spectacle lens, wherein the support comprises a first side and a second side opposite the first side; - an illumination appliance, arranged on the first side of the support for the spectacle lens, for guiding an illumination light beam onto the spectacle lens, arranged on the support, for identifying the signature mark; and - a reflector, arranged on the second side of the support and formed as a retroreflector; wherein the appliance comprises a visualization appliance arranged on the first side of the support for the spectacle lens and formed for receiving and visually displaying an observation light beam coming from the spectacle lens, wherein the visualization appliance is a mobile device having an image recording apparatus and an image displaying apparatus, in particular a smart phone or a tablet, characterized in that the illumination appliance is formed to lead the illumination light beam coming from an external light source onto the spectacle lens arranged on the support, wherein the visualization appliance is arranged detachably in a holder, wherein the appliance has a cable connection with the mobile device, in order to supply the appliance with electrical voltage from the mobile device, wherein the electrical voltage of the mobile device is used for operating an electric motor, in order to enable a movement of the reflector formed as a retroreflector, wherein a frequency of a periodic movement of the reflector formed as a retroreflector is matched to a synchronization signal of the visualization appliance. wherein the appliance comprises a visualization appliance arranged on the first side of the support for the spectacle lens and formed for receiving and visually displaying an observation light beam coming from the spectacle lens, wherein the visualization appliance is a mobile device having an image recording apparatus and an image displaying apparatus, in particular a smart phone or a tablet, characterized in that the illumination appliance is formed to lead the illumination light beam coming from an external light source onto the spectacle lens arranged on the support, wherein the visualization appliance is arranged detachably in a holder, wherein the appliance has a cable connection with the mobile device, in order to supply the appliance with electrical voltage from the mobile device, wherein the electrical voltage of the mobile device is used for operating an electric motor, in order to enable a movement of the reflector formed as a retroreflector, wherein a frequency of a periodic movement of the reflector formed as a retroreflector is matched to a synchronization signal of the visualization appliance.