"The eye is the window to the soul" is not just a poetic statement. It is a scientific fact. Just as a computer chip contains all the information of its program, the iris reveals the complete print-out of our nervous system. The very sensitive nerve knots in our eyes are connected to the entire nervous system of our body.
The eyes are responding to visual input which is interpreted by the brain according to its program. The eye is the only organ through which the brain can reach to the surface. The eyeball and its delicate skin are built from the same embryonic tissue as the brainitself.
We can imagine the eyeball as brain tissue sort of turned inside out and its skin as the extension of the brain skin. The iris is very fibrous and filled with many veins. It has the ability to record everything that was damaging to our nervous system in the form of markings on her visible surface. Each shock, physical, emotional or psychological, such as stress, injuries or operations causes a "scar", a blockage in our nervous system where the electrical current flow cannot pass any more freely.