1. A method for displaying information to a user during a medical procedure comprising the steps of: a. determining a field of view of the user through a head mounted display device worn by the user using one or more sensors for determining the field of view, the one or more sensors for determining the field of view include active sensors for sensing head orientation of the user, head location of the user, eye or eyes location of the user, or the eye or eyes orientation of the user; b. retrieving object information on one or more objects within the medical procedure within the field of view from the one or more sensors, the one or more objects within the medical procedure include one or more medical tools used in real time in the medical procedure and living bodies and/or living organs of the medical procedure, checking if the properties of the one or more object changed, the properties being selected from location, shape, size and orientation; c. retrieving by a processor supplemental object information from data storage, said supplemental object information includes one or more 3D generic models of the one or more objects from step b. in the field of view; d. integrating by a processor said retrieved object information on one or more objects within the field of view from the one or more sensors from step b. with the retrieved supplemental object information from step c. in real time to obtain models of the objects that can be displayed as a graphical representation with the same shape, size and orientation as through the said objects were visible to the user; and e. displaying by a display processor the models of objects of step d. in 3D on one or more display elements on the head mounted display device in real time, the objects being in the field of view, and repeating steps a. through e. for each movement of the user which changes said field of view of the user and every time said one or more objects changes a property selected from one or more of a location, orientation or shape, wherein said head mounted display is transparent or semi-transparent to allow the integrated information to be overlaid on the field of view to allow the user to continue to view objects of the one or more medical tools used in real time in the medical procedure and the living bodies and/or living organs in the field of view during the medical procedure.