In work that brings researchers closer to the goal of precision medicine approaches to treating glaucoma and other neurodegenerative vision diseases, a new IUPUI study has, for the first time, been able to identify a wide variety of previously unknown cell subtypes in the human eye. The cells—called retinal ganglion cells, also known as RGCs—are the neurons that take visual information from the eye to the brain for processing and interpretation, which is how we see things.