This study looks at how eye movements (oculometric measures) relate to Parkinson's disease (PD) symptoms. PD is a brain disorder that affects movement. The study involves 300 people with idiopathic PD, meaning their PD has no known cause. Participants will visit clinics every 3 months for 12 months (5 visits in total) for eye movement tests (30 minutes each). These tests use special technology to track eye movements and may help identify changes in PD faster than current methods.

Key Points:

• Study lasts 12 months with 5 clinic visits.
• Each visit includes a 30-minute eye test.
• Participants need stable PD medication during the study.

To join, you must be 40-85 years old, have had PD for 0-5 years, and have normal or corrected vision. You cannot join if you have epilepsy, other brain diseases, or drug/alcohol problems. Pregnant individuals or those who might be pregnant should not participate. Participants must provide informed consent and be able to sit calmly for 40 minutes.