A Heads-Up Display (HUD) system for mounting on a pair of glasses comprises a power module for providing electrical power removably mountable to one side of a lens assembly of the glasses, an electronics module connectable to receive electrical power from the power module, the electronics module removably mountable to an opposite side of the lens assembly of the glasses; and a display housing mounted on a display arm extending from the electronics module to a position within a field of vision of a user wearing the glasses. A pair of glasses adapted to receive a HUD system comprises a lens assembly providing one or more electrically conductive paths from a first side thereof to a second side thereof.