retina cell count retina horizontal cell count 2020-10-01T17:15:54Z CMO:0003558 The total number of horizontal cells in the retina, the innermost layer or coating at the back of the eyeball, which is sensitive to light and in which the optic nerve terminates. A horizontal cell is a neuron that laterally connects other neurons in the inner nuclear layer of the retina. clinical_measurement_ontology horizontal cell count slaulede