The missing information never reached your brain.
The light-sensitive retina lines the back of the eye. At one small location, nerve fibers gather and exit toward the brain as the optic nerve. That exit contains no photoreceptor cells, so light landing there cannot be recorded.
You do not normally notice the gap. The other eye covers some of it, and the visual brain uses surrounding color, texture and edges to construct a continuous scene. It does not place a dark hole over the missing patch. It predicts what belongs there.
No photoreceptors
Why your body does this
The blind spot is a structural consequence of the vertebrate retina. The wiring sits in front of the light-sensing layer, so nerve fibers need an exit. Your brain's ability to infer missing visual information keeps that anatomy from interrupting ordinary experience.
Vision is not a pixel-perfect recording of the outside world. It is a useful model assembled from incoming signals, context and prediction.
Another hidden nerve response appears on your fingertips.
See why water-induced wrinkles are controlled by the sympathetic nervous system.
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