manual

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An image that falls in the blind spot of the eye is not
transmitted to the brain.
visual area
optic nerve:
transmits
impulses to the
brain
lens
iris
cornea
pupil
retina
brain
blind spot: exit
point of the
optic nerve
The blind spot of the retina is where the optic nerve exits the eye and there
are no visual cells, so the brain cannot see an image that falls in this area. In
this experiment, at the moment when the yellow dot disappears, the light
reflected from the yellow dot is falling on the blind spot on the retina.
You don’t see an “empty” spot because the brain compensates by filling in
the area with blue (the surrounding color) where the yellow dot should
have appeared. Your brain is always “filling in” the blind spot with
surrounding images so you never even notice it!
Diagram of the eye