In the area of smart environments, vision-based sensing technologies are increasingly investigated to support aging-in-place within the context of Ambient Assisted Living (AAL) research. Range Imaging (RIM) constitutes an important technological innovation in the field of camera-based solutions. In fact, fusing together distance measurements with image processing capabilities, RIM overcomes limitations of passive vision traditionally pursued by camera-based solutions. This chapter aims to highlight the benefits of RIM technologies, in particular Time-Of-Flight (TOF)-based, in AAL applications.