Linked from
The 18 pages that link to Retinal ganglion cell, each with the reason it gives.
RetinaBroader topic: Ganglion cells collect processed retinal signals and form the optic nerve.
Optic nerveBroader topic: Their axons bundle together to form the optic nerve.
Intraocular pressureBroader topic: These cells are lost as glaucomatous damage progresses.
PhotophobiaBroader topic: A subset of these cells responds to light and can influence discomfort.