I can't tell if this report is vapor research or there is something of merit. For example, if only tested on mice, then how is this related to Parkinson's Disease, can anyone clarify?
There is something of merit here if there's any reason to believe that actual Parkinson's patients show similar retinal degeneration far before they show any other symptoms. The authors don't mention any evidence for that...so I'm guessing there's not any. Either they are wildly scrambling to find some, or a cynic might suggest they looked already in humans and didn't find any, so they published this instead. A paper showing multiple lines of evidence supporting their theory in a rodent model and in a patient population would probably have been a home run that got them into a glam mag.