1. An augmented reality system providing improved focus of objects comprising: a see-through display device having a support structure, the see-through display positioned by the support structure and one or more physical environment facing cameras positioned by the support structure for capturing depth images of a space in which the see-through display device is located; a memory storing software and data; a processor determining a three-dimensional current field of view as seen through the see-through display based on a three dimensional model of the space in which the see-through display device is located and the captured depth images under the control of software, the processor having access to the memory and being communicatively coupled to a microdisplay assembly; the processor being operable to determine a current focal region in the three dimensional current field of view; the microdisplay assembly attached to the see-through display device, the microdisplay assembly including a microdisplay, one or more optical elements, and a variable virtual focus adjuster for changing an optical path between the microdisplay and the one or more optical elements of the microdisplay assembly; the processor causing the microdisplay assembly to generate an in-focus virtual image which will display in-focus in the determined current focal region by controlling the variable virtual focus adjuster to adjust a focal region of the microdisplay assembly based on detected edges of the objects to identify distinct objects for enhancement; and the see-through display of the see-through display device being optically coupled to receive and to display the in-focus virtual image generated for the determined current focal region.