Fig. 1. Intraretinal axon guidance. Ganglion axons at all positions inside the retina travel in the optic fiber layer (OFL) and project to the center of the retina, the optic disc (OD). At the optic disc, the ganglion axons exit the retina and join the optic nerve (ON). GCL, ganglion cell layer (where the cell bodies of the ganglion cell reside). PR, photoreceptor layer (where the photoreceptor cells are localized at the other side of the retina).