The study is looking at a new way to help find Parkinson's Disease early. This method uses a special camera to take pictures of the back of the eye, called the retina, without needing to do anything invasive, which means nothing goes inside the body. Researchers want to see if this method works better than the usual test called DAT-PET, which is a type of brain scan.

To be part of this study, you need to be between 40 to 80 years old. Some people with Parkinson's, other movement disorders, and those without any symptoms might be asked to join. They will compare how well the new eye test works against the brain scan.

If you’re interested, you must not have eye diseases like glaucoma, or severe health issues like heart disease. You also shouldn't be pregnant or have certain infections or mental health problems.

• The study is observational, meaning it looks at data without changing any treatments.
• Participants will undergo non-invasive eye imaging.
• The study compares this new test with a conventional brain scan.