Linked from
The 21 pages that link to Optic nerve, each with the reason it gives.
GlaucomaBroader topic: Glaucoma progressively injures its retinal nerve fibers.
BlindnessBroader topic: Injury can interrupt signals even when the eye detects light normally.
Retinal ganglion cellBroader topic: Ganglion-cell axons converge to form the optic nerve.
Visual systemBroader topic: It carries retinal output into the brain’s visual pathways.