A method for contactless initiation and controlling of a videoconference between a user in a sterile environment comprising one or more imaging instruments, and one or more remote users from a predetermined list of a plurality of remote users, via a server, the server comprising a user database and an instrument database, the user database comprising the remote users of the predetermined list and a separate, optically readable representation, preferably a QR code, for each of the remote users of the predetermined list, the instrument database comprising a plurality of imaging instruments, preferably electronic units representing the imaging instruments, and a separate, optically readable representation, preferably a QR code, for each of the imaging instruments, preferably for each of the electronic units, the user wearing in the sterile environment a wearable, hands-free image sensor, preferably provided on the user's head, the image sensor being wirelessly connected to the server, the method comprising the following steps: a. providing, in the sterile environment and visually perceptibly, the separate, optically readable representations of at least a subset of the plurality of remote users; b. providing, in the sterile environment and visually perceptibly, the separate, optically readable representations of the one or more imaging instruments in the sterile environment; c. starting up the videoconference by the user in the sterile environment, preferably by reading in with the image sensor an optically readable representation provided in the sterile environment associated with the videoconference and/or with the user in the sterile environment; d. reading in and processing with the image sensor the optically readable representations of one or more remote users to be invited from the user database for the videoconference, wherein the remote users to be invited are invited to the videoconference; e. reading in and processing with the image sensor the optically readable representations of one or more imaging instruments to be visualized from the instrument database, wherein the visual output of the one or more imaging instruments to be visualized is shared during the videoconference; f. joining the videoconference by one or more invited remote users through a connection of an electronic display device of the remote users to the server; g. initiating the videoconference by the user in the sterile environment; wherein the remote users in the videoconference are shown via their screen a graphical presentation comprising several sections (2a, 2b), wherein each of the remote users in the videoconference, the user in the sterile environment and the imaging instruments to be visualized are visualized separately in one of the sections, and wherein sections associated with one of the imaging instruments to be visualized display at least the visual output of said instrument; wherein the remote users who have joined the videoconference gain control over the shared visual output, this control comprising at least manipulating focus and contrast of the shared visual output or visually perceivably annotating the shared visual output in the videoconference. a. providing, in the sterile environment and visually perceptibly, the separate, optically readable representations of at least a subset of the plurality of remote users; b. providing, in the sterile environment and visually perceptibly, the separate, optically readable representations of the one or more imaging instruments in the sterile environment; c. starting up the videoconference by the user in the sterile environment, preferably by reading in with the image sensor an optically readable representation provided in the sterile environment associated with the videoconference and/or with the user in the sterile environment; d. reading in and processing with the image sensor the optically readable representations of one or more remote users to be invited from the user database for the videoconference, wherein the remote users to be invited are invited to the videoconference; e. reading in and processing with the image sensor the optically readable representations of one or more imaging instruments to be visualized from the instrument database, wherein the visual output of the one or more imaging instruments to be visualized is shared during the videoconference; f. joining the videoconference by one or more invited remote users through a connection of an electronic display device of the remote users to the server; g. initiating the videoconference by the user in the sterile environment; wherein the remote users in the videoconference are shown via their screen a graphical presentation comprising several sections (2a, 2b), wherein each of the remote users in the videoconference, the user in the sterile environment and the imaging instruments to be visualized are visualized separately in one of the sections, and wherein sections associated with one of the imaging instruments to be visualized display at least the visual output of said instrument; wherein the remote users who have joined the videoconference gain control over the shared visual output, this control comprising at least manipulating focus and contrast of the shared visual output or visually perceivably annotating the shared visual output in the videoconference.