An object (3) is imaged and, after image processing, an image is displayed on a head-mounted display (10) in front of the eyes of a user of the display. The display (10) is constructed with two display modules (13, 14) for displaying the image, designed to be positioned in front of each eye within a limited section of each eye's field of vision, the display modules being arranged each to show a separate image and being designed to leave the field of view free towards the surroundings at least downwards and to the sides of the user. The display modules (13, 14) are advantageously arranged to show two different images, one in front of each eye, so that the user experiences a stereoscopic image with a perception of depth in a part of his field of vision at a predetermined distance in front of his eyes.