1. An interactive head-mounted display device, comprising: an optical assembly through which at least a portion of a surrounding environment and displayed content are viewable; an integrated processor for handling content for display; an integrated image source for introducing the content to the optical assembly; a temple arm extending from the optical assembly to an end, the temple arm forming an interior cavity that extends from the end along a length of the temple arm and configured to receive an adjustable extension; and an adjustable extension slideably connected through the mouth at the end of the temple arm into the interior cavity toward the optical assembly, the adjustable extension slideable within the interior cavity of the temple arm to selectively change a collective length of the temple arm and the adjustable extension by an amount that is inversely proportional to a corresponding change in an overlap length of the temple arm and the adjustable extension.