• Variability of numbers of ionotropic glutamate receptors associated with different ganglion cells |
• Variability of receptor types associated with ganglion cells (for example, nicotinic cholinergic, GABAergic, serotonergic, dopaminergic) |
• Variability of natural protective mechanisms (for example, calcium binding proteins or chaperones) associated with different ganglion cells |
• Variability of vascular supply to different ganglion cells |
• Variability in damage to ganglion cell axons in optic disc area |
• Susceptibility of ganglion cells associated with size of somata and/or axon diameter |