Visual nerve

Visual nerve - the visual nerve is in reality not nerve but as the retina an outgrowth from the brain. The visual nerve leaves the retina there are no visual cells and this point is therefor called papill. The visual nerve is approximately 4.5 cm long and is covered with the brain's membrane. The visual nerves are crossing before they reach the brain, so information from the right and left eye is mixing and reach both cerebral hemispheres. It's the visual nerve that is damage when glaucoma.