Abstract: A binocular device including two ocular units and directing means to allow a user to view a display, the display being moveable when the distance between the ocular units is varied for interocular adjustment to maintain focus on the display. Instead of the display being movable, focus can be maintained by the inclusion in the directing means of optical relays for transmitting parallel light. In a further embodiment, a sensor is provided, the output of which is directed for viewing via the ocular units. In yet another embodiment, image capture means are provided for recording the image from the ocular units.

Abstract: A viewing device containing one or more display screens and adjustment means to allow the device to be adjusted to suit a user's interocular distance, wherein alignment means are provided to check the alignment of the device with the wearer's eyes.