Interestingly, AD patients also show optic nerve degeneration and loss of retinal ganglion cells, β-amyloid and tau protein deposition in the retina Wostyn et al. (2009); Ramirez et al. (2017), and alteration of functional connectivity between visual areas dedicated to recognition like the fusiform and the inferior temporal gyri. The gene discussed is MAPT; the disease is Alzheimer disease.