Each eye contains a place where seeing stops.
At the optic disc, retinal nerve fibers gather and leave the eye as the optic nerve. There are no rods or cones there, so that patch supplies no visual information.
Yet ordinary sight does not contain a black hole. With both eyes open, one eye often supplies what falls on the blind spot of the other. With one eye, perception usually completes the region using the surrounding color, texture, and lines.
A simple blind-spot test exposes the mechanism. Hold your gaze on one mark while moving another through the visual field. At a certain point, the second mark disappears. The space around it still looks continuous.
The illusion is not the blind spot. The blind spot is physical. The illusion is that a seamless experience must come from seamless input.
A real absence can sit inside the center of ordinary vision without looking absent at all.