Optic nerve

second cranial nerve, which connects the eyes to the brain

The optic nerve, also known as cranial nerve II or simply as CN II, is one of twelve cranial nerves but is also considered to be part of the central nervous system. It sends information from the retina (the outermost part of the eye) to the brain. The brain forms a picture using the information so that you can see things. The retina sees the image upside-down and the optic nerve sends it to the brain so it turns it back into normal. [1]


  1. M.D, Gregory H. Scimeca (11 November 2019). "Your Eyes See Upside Down and Reversed - Board Certified Eye Doctors | Burlington Bucks County Millville". Retrieved 15 October 2023.