The invention relates to a visualization device (10) which contains an imaging optical system (12) for generating a monitoring image of an object region (20) and which has a display device (34) with a display (36) for visualizing an image with orientation information, said image being superimposed on the monitoring image of the object region (20). The visualization device has an image detecting device (26) for detecting an image of the object region. The visualization device (10) has a computing system (43) which calculates image data containing the orientation information from an object region image detected by means of the image detecting device (26) and transmits the image data to the display device (34). The imaging optical system comprises a binocular tube (18) for visualizing the object region, said binocular tube comprising an optical monitoring beam path (22a, 22b), and a beam separator (30) which is arranged in the optical monitoring beam path (22a, 22b) and which transmits the monitoring image of the object region (20) to the image detecting device (26). The imaging optical system also has a beam separator (40) which is arranged in the optical beam path (22a, 22b) and which superimposes the image (46) displayed by means of the display device (34) on the monitoring image of the object region (20) and transmit the image to the binocular tube (18). The computing system (43) corrects at least one systematic error of the image (46) displayed by means of the display device (34) with respect to the monitoring image while calculating the image data, said error being caused by manufacture, assembly, and adjustment tolerances of the display (36). The computing system adjusts at least one correction parameter from the parameter group consisting of magnification, azimuth rotation, and shifting for the displayed image which is superimposed on the monitoring image, said correction parameter being ascertained by comparing the monitoring image of a reference object with a
