Macular Degeneration and Parkinson’s Disease: Is There a Link?
The Link Between AMD and Parkinson's, at a Glance
If you have age-related macular degeneration (AMD) and have read that it might be tied to Parkinson's disease, it is fair to want a straight answer. Here it is: research has found a modest statistical link between the two, but AMD is not known to cause Parkinson's disease, and most people with AMD never develop it.
A 2024 review that pooled five studies and more than 4.7 million people found that people with AMD had a higher risk of later developing Parkinson's disease, about 1.4 times the risk of people without AMD1. A higher relative risk is not the same as a high personal risk, which this page explains.
The studies behind this link are observational, meaning they watch large groups over time and look for patterns. They can show that two conditions tend to occur together, but they cannot prove that one triggers the other. The authors of the pooled analysis specifically cautioned that their findings cannot establish causation1.
For a person with AMD, this research does not call for panic or new tests for Parkinson's disease. The sensible response is to keep up your regular eye care, look after your general and brain health the way anyone your age should, and mention any new movement symptoms to your doctor. The rest of this page walks through the evidence and what it does, and does not, change.
The Two Conditions and Why Researchers Compare Them
Parkinson's disease is a progressive brain disorder that affects movement, causing symptoms such as tremor, muscle stiffness, slowness of movement, and balance problems, along with non-movement symptoms like mood changes3. Parkinson's disease is progressive and currently has no cure3. A doctor manages it over time with available treatments.
The reason researchers even ask about a link is that the eye and the brain are closely related. The retina shares a common origin and similar anatomy with brain tissue, which is why scientists study it as a window onto the brain4. Both AMD and Parkinson's disease also involve the gradual loss of specialized nerve-related cells with age, so it is natural to wonder whether they share deeper roots.
What the Research Says About the Connection
The strongest single summary comes from a pooled analysis. A 2024 systematic review and meta-analysis combined five studies covering 4,771,416 people, of whom 128,771 had AMD, and found AMD was associated with a higher risk of Parkinson's disease (hazard ratio 1.44)1. The link was stronger for wet, or neovascular, AMD, where the pooled risk was about 2.2 times higher1.
Putting those relative numbers into real counts helps. In a Taiwanese study of 20,848 people, Parkinson's disease occurred at a rate of about 7 per 1,000 each year in the AMD group compared with about 5 per 1,000 in matched people without AMD5. After accounting for other factors, the AMD group's risk was about 1.35 times higher5.
Scientists are testing possible explanations, not confirmed ones. Misfolded alpha-synuclein, the protein central to Parkinson's disease, can accumulate in the retinal layers4. Because of this, retinal changes are being studied as a way to help detect and monitor Parkinson's disease4. This is a promising research direction, not a test your eye doctor uses today.
How Strong Is the Evidence
All the human evidence here comes from observational studies that follow health records over time. This design is good at spotting associations across huge populations, which is why a pooled sample of millions is possible. But observational findings like these cannot establish that AMD causes Parkinson's disease, as the meta-analysis authors themselves noted1.
Two conditions can travel together for reasons that have nothing to do with one causing the other. Both AMD and Parkinson's disease become more common with age, and they may share risk factors such as smoking, inflammation, and blood-vessel health. When shared factors drive both, a link appears in the data even if neither condition triggers the other. That is why careful researchers describe this as an association to explore, not a proven pathway.
A higher relative risk can sound alarming until you look at the actual numbers. Even in the AMD group of the Taiwanese study, only about 7 of every 1,000 people developed Parkinson's disease each year5. In other words, the great majority of people with AMD did not develop Parkinson's disease over the study. A 1.4-times relative increase on a small baseline is still a small absolute chance.
What a Possible Link Means for People With AMD
The honest answer is no, not in the sense of daily worry. The reported increase in Parkinson's disease risk is modest, roughly 1.4 times, and stronger only for wet AMD at about 2.2 times1. Because the starting risk is low, even the wet-AMD figure leaves most people unaffected. No one can predict an individual's future, but the population picture is reassuring, not frightening.
This research does not change your AMD care, and there is no recommended Parkinson's screening test for people with AMD based on it. What it reinforces is sensible: keep your eye appointments, manage general health factors like blood pressure and not smoking, stay physically active, and speak up if you notice new movement changes. Those steps are worthwhile regardless of any link between the two conditions.
When to Talk to a Doctor
Some vision changes should not wait for a routine visit. Call your eye doctor promptly, ideally within a day or two, if you notice any of the following:
- New or sudden distortion, such as straight lines that look wavy or bent6
- A new blurry, dark, or empty spot in your central vision2
- A noticeable, unexplained drop in your central vision in one eye
A sudden increase in distortion can signal a change from dry to wet AMD, which is more treatable the sooner it is caught6. Acting quickly protects vision; it is not a reason to panic.
This is about general awareness, not screening yourself for a disease. Parkinson's disease can cause a tremor, stiffness, slowness of movement, and balance problems, often starting mild and on one side of the body first3. If you notice new symptoms like these, mention them to your primary care doctor, who can decide whether an evaluation is warranted. Many such symptoms have other, more common explanations.
Your ongoing eye care is shared between your regular eye doctor and, when wet AMD is present, a retina specialist. Movement concerns are handled first by your primary care doctor, who can refer you to a neurologist if needed. Keep your scheduled dilated eye exams even when your vision feels stable, since early AMD often has no symptoms, and your eye doctor will set the right follow-up interval for you.
Common Questions About AMD and Parkinson's
No. Research shows the two are statistically linked, not that AMD causes Parkinson's disease. The authors of the largest pooled analysis cautioned that their findings cannot establish causation1. The link most likely reflects shared factors like aging and blood-vessel health rather than one condition triggering the other. Having AMD is a reason to keep up good general and eye health, not a reason to expect Parkinson's disease.
For most people, the chance is low. In one large study, about 7 of every 1,000 people with AMD developed Parkinson's disease each year, compared with about 5 per 1,000 without AMD5. That is a small increase on a small baseline, so the great majority of people with AMD never develop Parkinson's disease. Your own doctor can put your personal picture in context.
The research suggests wet AMD carries a somewhat stronger association. In the pooled analysis, neovascular (wet) AMD was linked with about a 2.2-times higher risk of Parkinson's disease, compared with about 1.4 times for AMD overall1. Even so, because the baseline risk is low, most people with wet AMD will not develop Parkinson's disease. This is a reason to stay engaged with care, not to be alarmed.
There is no recommended Parkinson's screening test based on having AMD, and this research does not create one. Retinal imaging is being studied as a possible future way to detect and monitor Parkinson's disease, but it is not a clinical test today4. The practical step is awareness: if you notice new movement symptoms, tell your doctor. Otherwise, continue your normal eye care and general health checkups.
More Questions About Risk and Next Steps
Because the eye is closely related to the brain. The retina shares a common origin and similar anatomy with brain tissue, so scientists study it as a window onto the brain4. Both AMD and Parkinson's disease involve age-related loss of specialized cells, which is why researchers look for shared processes. This connection is a scientific starting point, not evidence that your eye condition is spreading to your brain.
There is no evidence that AMD treatment changes Parkinson's disease risk, and no study has tested that. AMD treatments such as AREDS2 vitamins for intermediate AMD and anti-VEGF injections for wet AMD are aimed at protecting vision6. They are worth using for your eyes on their own merits. The best general advice for brain health, like not smoking and staying active, stands apart from your AMD care.
Parkinson's disease can affect vision in its own ways, separate from AMD. Because misfolded alpha-synuclein can accumulate in the retina, researchers are examining retinal changes in Parkinson's disease4. If you have both conditions, it is worth telling each of your doctors, so your eye care and neurology care take the full picture into account. Report any new visual or movement changes promptly.
- Given my type and stage of AMD, what is a realistic way to think about my Parkinson's disease risk?
- Are there general health steps that support both my eyes and my brain?
- What movement symptoms should prompt me to call you?
- Do I need any additional testing, or just normal follow-up?
- How often should I have my dilated eye exams?
- If I already have both conditions, how should my doctors coordinate?
- Medicine (PMC full text, systematic review and meta-analysis) (2024). The association between age-related macular degeneration and risk of Parkinson disease: A systematic review and meta-analysis.
- National Eye Institute (NEI) (2024). Age-Related Macular Degeneration.
- Cleveland Clinic (2024). Parkinson's Disease: What It Is, Symptoms & Treatment.
- Frontiers (PMC full text, mechanistic review) (2022). Retinal Degeneration: A Window to Understand the Origin and Progression of Parkinson's Disease?.
- BMC Ophthalmology (PMC full text, retrospective cohort) (2021). Increased risk of Parkinson's disease among patients with age-related macular degeneration.
- American Academy of Ophthalmology (AAO) (2024). Understanding Macular Degeneration.