A user assistance system for reusable medical devices comprising data glasses with a camera, an imaging optical module with a projection surface, wherein the user assistance system furthermore comprises a data memory in which a plurality of type datasets (30a, 30b, 30c) are saved that each comprise information relating to an identifying feature of a specific medical device type, and information relating to instructions for reprocessing these medical device types, wherein: - the imaging optical module is configured to project visual information onto the projection surface arranged within the field of vision of a user of the data glasses, - the user assistance system is configured to record an image of a reusable medical device with the camera, to compare the image data of the image with the information relating to the identifying features in the type datasets (30a, 32a, 34a), to identify a type of the reusable medical device using an identifying feature available within the image, and to activate a type profile assigned to an associated type dataset, wherein the user assistance system is furthermore configured to: - record a user identifying feature and compare it with user datasets (32a, 32b, 32c) saved on the data memory which each comprise information relating to at least one user identifying feature and, in the event of correspondence, to activate a user profile assigned to the user dataset (32a, 32b, 32c), - record a location identifying feature (51, 53) and compare it with location datasets (34a, 34b, 34c) saved on the data memory which each comprise information relating to at least one location identifying feature (51, 53) and, in the event of correspondence, to activate a location profile assigned to the location dataset (34a, 34b, 34c), - characterized in that the data memory comprises information relating to instructions for reprocessing medical devices that are assigned to at least one type profile, at least one user profile and at least one location profile, and wherein the instructions for reprocessing the medical device assigned to the active type profile, the active user profile and the active location profile are displayed as visual information on the projection surface. - the imaging optical module is configured to project visual information onto the projection surface arranged within the field of vision of a user of the data glasses, - the user assistance system is configured to record an image of a reusable medical device with the camera, to compare the image data of the image with the information relating to the identifying features in the type datasets (30a, 32a, 34a), to identify a type of the reusable medical device using an identifying feature available within the image, and to activate a type profile assigned to an associated type dataset, - record a user identifying feature and compare it with user datasets (32a, 32b, 32c) saved on the data memory which each comprise information relating to at least one user identifying feature and, in the event of correspondence, to activate a user profile assigned to the user dataset (32a, 32b, 32c), - record a location identifying feature (51, 53) and compare it with location datasets (34a, 34b, 34c) saved on the data memory which each comprise information relating to at least one location identifying feature (51, 53) and, in the event of correspondence, to activate a location profile assigned to the location dataset (34a, 34b, 34c), - characterized in that the data memory comprises information relating to instructions for reprocessing medical devices that are assigned to at least one type profile, at least one user profile and at least one location profile, and wherein the instructions for reprocessing the medical device assigned to the active type profile, the active user profile and the active location profile are displayed as visual information on the projection surface.