optic nerve, section of the brain seen from the side. nerve injury. poor eyesight. optic neuritis

anatomy background biology black body brain care choroid cornea cross diagram disease education eye eyeball eyesight glaucoma graphic health human inflammation injury iris isolated lens light loss macula macular medical medicine muscle nerve neuritis ophthalmology optic optical organ partial poor pupil rendering retina retinal science sclera section seen side sight structure total view vision visual vitreous white