To do this,
primates have two forward - facing
eyes that capture the same view from slightly different angles,
and a visual system that keeps information from each
eye separate until it reaches the
brain's visual cortex.
In both
primates and rodents, messages from the two
eyes enters the
brain through a small structure called the lateral geniculate nucleus or LGN, which is made of slivers of nerve cells, arranged like sponge in a layer cake.