To the brains

At a certain place in the brains, at height of the cerebral cortex, all perceptions of the rods and cones are caught and converted. Both optic nerves join there. And then something peculiar happens. The brains constantly correct the incoming information and they add some fantasy at it. Therefore you don't see what you really see, but what the brains “translate”. In fact looking is one big puzzle of our brains. If you look at something, you overlook the whole surface. The brains get lots of informations and make it into one .

The visual centre has a connection with other centres of the brains. The information is compared, much quicker than the fastest computer could do, with all what's already been filed in the memory. In that way the brains try to make the incoming information “useful”. Whatever you see, is always coloured by the things you've seen and experienced before.

Central and peripheral

Central in seeing is the yellow spot. Only at that spot we can see sharply. With the rest of the retina we look unsharply. Therefore the yellow spot is called the central visual centre; the rest is the peripheral visual centre.

The nerves of the outside of the eye-ball can turn the eyes. In that way we are able to focus our eyes. To focus means: move the head and eyes in such a way that the image enters the yellow spot. So we are able to look sharper.

Still the peripheral visual centre is very important. Through it you are able to orientate and it allows us to observe enough elements from our surroundings. Thank to your peripherical visual centre you are able to see the sidewards movement of a pedestrian at the other side of the street.