Explanation of the blind spot
There are no visual cells at the blind spot, so the brain actually lacks any image information at this point. You may have noticed that the blind spot is not perceived as completely empty or black. Instead, the brain uses the information from the surrounding visual cells to compensate for the missing image information.
The blind spot is basically the point where the optic nerve is bundled on the retina. If you use a white sheet of paper, the place where the symbol was previously located appears to be white. The brain estimates the missing image in the blind spot from the surroundings.
The surrounding sheet of paper is white, so it is only likely that there is also a white area at the missing spot. So this simple test impressively demonstrates a few basic characteristics of our vision. What we perceive as an exact image of our surroundings is actually information that has already been processed and prepared by the brain.
At the blind spot the brain lacks the visual information. However, it is able to cleverly compensate for this lack so that it is never noticed in everyday life.
