Iridology is the science of the iris. Iridologists assess the body according to the irides (the coloured area of the eye). The iris is one of the most complex structures of human anatomy. To an iridologist, specific areas of the irides correspond to specific organs, tissues and body areas; and colours and textures suggest biochemical changes. The iris contains bundles of thousands of nerve fibers and is a reflection of the entire body. The iris is connected to every organ and tissue of the body by way of the brain and central nervous system through the optic nerve.