When visual information about an object’s distance is obscured, but its retinal size visible, the object’s physical size is ambiguous to vision; however, additional proprioceptive distance information permits physical size to be estimated when grasping the object, but perceptual size estimates remain inaccurate, adding to that evidence for distinct visual pathways for perception and action.
Kentridge, R. (2018). Vision: Non-illusory Evidence for Distinct Visual Pathways for Perception and Action. Current Biology, 28(6), R264-R266. https://doi.org/10.1016/j.cub.2018.02.016