Retinal Imaging in Neurodegenerative Disease

Inclusion Criteria: * Adults with neurodegenerative disease ((MCI, PD, AD, FTD, DLB, ALS, MS, HD, TBI, concussion, PTSD and other neurodegenerations as well as Down Syndrome) * Adults without neurodegenerative disease Exclusion Criteria: * Inability to cooperate with or complete testing or other neurologic or age- related ocular conditions that would impact image acquisition. * Eyes that have had intraocular surgery, other than cataract surgery. If two eyes satisfy the inclusion criteria, both eyes will be included in the study. If one eye satisfies the inclusion criteria, the eye that qualifies will be included in the study.