Berkeley argued that visual cues, such as the perceived extension or ‘confusion’ of an object, can only be used to indirectly judge objects.
Our vision is very limited, we only see a minute part of the world in which we live in. The perceptual system of the brain enables us to see the world as visually stable, even though the sensory information (ie: color and intensity of light) are typically rapidly changing. A sheet of white paper will, within reason, eventually look white under any lighting conditions. So for me, as a Photographer when I perceive an object there is no guarantee of visual consistency or permanence.