Optical glasses; eyewear, namely, digital video glasses; stereoscopes; digital video players; digital audio and video players; portable media players; downloadable augmented reality software for medical teaching for use in mobile devices; downloadable augmented reality software for use in mobile devices for integrating electronic data with real world environments for the purpose of medical teaching; downloadable augmented reality software for use in playing computer games; downloadable virtual reality game software; headsets for mobile phones; wireless headsets for smartphones; headsets for use with computers; stands adapted for mobile phones; headsets for virtual reality games