Abstract
By the term colour stereoscopy we mean that the colour of an object has an influence on its apparent distance in binocular perception. It is usually explained in terms of the chromatic aberration of the eye, together with the eccentric position of the fovea. In this paper we demonstrate that this theory only partly explains the phenomenon and that the disorientation of the retinal receptors- as it becomes manifest in the Stiles- Crawford effect- must have an equivalent influence. A complete experimental verification met severe difficulties which have only partly been overcome.