The term ‘depth cue’ is fundamental to and widely used in depth perception literature. Despite its prevalence, there is virtually no scholarship on the theoretical foundations and the coherence of the concept of a cue in vision science. The aim of the present dissertation is to fill this theoretical desideratum. In the first section of the thesis, the historical models of the current concept of a cue are identified by means of a relevant selection of traditional theories of depth perception. It is shown that, in spite of partially differing conceptual embeddings, the logical status of the depth cues remains to a greater or lesser extent unaltered across these traditional theories and, more importantly, is linked to a central conceptual problem, namely, that the explanations of the functioning of the depth cues always need to presuppose, in a more or less concealed way, that which is actually to be explained (i.e., a perception of something). The current information processing paradigm related characterizations of the concept of depth cues are the focus of the second section of the thesis. On the basis of a further examination of the implicit assumptions of this paradigm, the aforementioned problem of circularity is established here as well. In light of the preceding theoretical considerations, the third part of the thesis demonstrates, how the concept of depth cues is typically used in visual perception research. It is shown that drawing on this concept heuristically can yield relevant and interesting empirical results, yet these are shown to be ultimately incomprehensible due to the inherent theoretical problems of the concept of depth cues.