Visual Pathway from Eye through Brain Objects in the right visual field stimulate the left half of each retina, and objects in the left visual field stimulate the right half of each retina. The optic nerves, one exiting each eye, are formed by the axons of retinal ganglion cells emerging from the retina. Just before they enter the brain at the optic chiasm, about half the nerve fibers from each eye cross. The left half of each optic nerve (representing the right visual field) runs through the brain’s left hemisphere via the thalamus, and the right half of each optic nerve (representing the left visual field) travels this route through the right hemisphere. So, information from the right visual field ends up in the left hemisphere and information from the left visual field ends up in the right hemisphere.