Microglial activation has been linked to retinal degeneration in CNS disorders (25) and others like Alzheimer’s, Parkinson’s, and Huntington’s diseases (26); therefore, the number of CX3CR1-positive microglia was evaluated in vivo using cSLO over a period of six weeks following HHI-LI-PRL. Here, CX3CR1 is linked to Parkinson disease.