decreased sensory neuron number decreased retinal ganglion cell number MP:0006309 MPheno.ontology reduced number of ganglion neurons located in the innermost nuclear layer of the retina of that receive visual information from photoreceptors via various intermediate cells such as bipolar cells, amacrine cells, and horizontal cells; axons from these cells form the optic nerve and connect mainly to the lateral geniculate nucleus (LGN) and to the suprachiasmatic nucleus in the brain reduced retinal ganglion cell number abnormal retinal ganglion cell morphology