The axons from the ganglion cells are bundled together in the optic nerve and travel to a point right behind the eyes, where they come together in the optic chiasm. The retina is vertically split in the centre of it, the inner half of it is called the nasal(closest to the nose) part and the outer one the temporal half. The temporal half from both eyes heads straight to the visual cortex and the nasal halfs crossover in the optic chiasm. The crossover implies that the nasal halfs head to the visual cortex on the opposite side of the brain. In other words, all stimuli on the left side of the world you see are processed by components of the right side of the visual system, and the reverse is true[1][3].