The virtual assembly instructions show him step by step which strand of cable has to be routed where. He has both hands free and does not have to keep getting down from the wing to study the layout plan. In virtually planned heart or brain operations the surgeon can also reach the diseased tissue by precisely the route he has envisaged. This minimizes the risk for the patient. Such questions frequently crop up in practice but the answers to them are, unfortunately, normally not very reliable.
Augmented Reality can prevent many a false move from the outset.
In another variant a tiny screen is attached to the frame of the glasses, from which information is directed to the lens. This lens is actually a transparent mirror which guides the information into the sight of the wearer. Another alternative for the future could be 'Virtual Retinal Displays', in which the image is projected by laser straight into the eye. The best solution turned out to be a tiny camera fastened to the data-glasses and sending 25 images per second to the computer. This compares the image information with previously stored orientation points on the object and calculates the user's current position and line of vision.