Optic Nerve Head
Impulses received from photoreceptive cone and rod cells are transmitted through nerve fibers embedded in the retina. As the nerves converge to form the optic nerve, they travel to a structure referred to as the optic chiasm where the neural fiber for each eye splits into to two pathways. At this point, one pathway from each eye crosses over so that it will lead to the opposite hemisphere of the brain. The nerve fibers eventually become the optic tract and extend to reach the visual cortex in the occipital lobe at the rear of the brain. The brain interprets the light signals as visual information.