The third respect in which action is central to the New Theory is psychological. Tangible ideas of distance are elicited not only by (1) visual or “pictorial” depth cues such as object’s degree of blurriness (objects appear increasingly “confused” as they approach the observer), but also by kinaesthetic, muscular sensations resulting from (2) changes in the vergence angle of the eyes (1709: §16) and (3) accommodation of the lens (1709: §27). Like many contemporary theories of spatial vision, the Berkeleyan account thus acknowledges an important role for oculomotor factors in our perception of distance.