What is the optic nerve?

The vision conduit: The optic nerve (cranial nerve ii) is a large nerve or conduit that transmits electrical signals generated when light particles (photons) hit the retina inside the eye to the occipital lobe of the brain which then converts these signals into the sense of vision. It is like an electrical wire from the eye to brain. If this nerve is damaged by trauma or disease, vision will be affected or lost.

Optic nerve: The optic nerve is at the back of the eyeball and transmits visual information from the eye to the brain.