Retinal Scans and Atrial Fibrillation: What Research Shows
Medical Disclaimer: The information provided in this article is for educational and informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider regarding any medical condition or treatment.
Can Retinal Scans Help Identify Atrial Fibrillation Risk?
Atrial fibrillation (AFib) is a common irregular heart rhythm that can increase the risk of stroke. Some people have no symptoms, so researchers are exploring whether eye scans could offer early clues about heart-rhythm risk.
A large research study found that people with AFib tended to have thinner areas in part of the retina, the light-sensitive tissue at the back of the eye. This is an interesting association, but retinal imaging is not currently a stand-alone test for diagnosing or predicting AFib.[journals.plos][journals.plos]
What Is Atrial Fibrillation?
Atrial fibrillation is an irregular, often fast heartbeat. It happens when the heart’s upper chambers beat out of sync with the lower chambers. This can allow blood to pool in the heart and form clots.[nhs][heart]
AFib increases the risk of ischemic stroke. The American Heart Association notes that AFib is associated with an estimated fivefold higher risk of stroke.[heart][cdc]
AFib Symptoms Can Be Easy to Miss
Some people with AFib have no symptoms. Others may notice:
- A fluttering, pounding, or racing heartbeat
- An irregular pulse
- Tiredness or reduced exercise tolerance
- Shortness of breath
- Dizziness or lightheadedness
- Chest pain or tightness[nhs][cdc][mayoclinic]
Because symptoms can come and go, AFib is sometimes found only during a routine checkup or after testing for another condition.[nhs][nhsinform]
How Is AFib Diagnosed?
AFib is diagnosed with an electrocardiogram (ECG), which records the heart’s electrical activity. If AFib comes and goes, a clinician may recommend a portable ECG monitor that records heart rhythm for 24 hours or longer.[nhs][nhsinform][ahajournals]
Other tests may include an echocardiogram, blood tests, or imaging to look for underlying causes and assess stroke risk.[nhs]
A smartwatch or fitness tracker may flag an irregular rhythm, but it cannot diagnose AFib by itself. Any alert should be reviewed by a healthcare professional.[england.nhs][bhf.org]
What Did the Retinal Study Find?
Researchers analyzed retinal imaging data from more than 90,000 people across two large studies: AlzEye and the UK Biobank. They used retinal photographs and optical coherence tomography (OCT), a scan that creates detailed cross-sectional images of the retina.[journals.plos][journals.plos]
The study found that people with AFib had measurable thinning in certain retinal layers, especially the macular ganglion cell–inner plexiform layer (mGCIPL) and inner nuclear layer. A thinner mGCIPL was also seen in the UK Biobank group.[journals.plos][journals.plos]
Some participants with thinner retinal layers at baseline were more likely to develop AFib later. However, this does not prove that retinal thinning causes AFib or that an eye scan can predict it accurately in an individual person.[journals.plos][journals.plos]
Why Might the Eye Reflect Heart Health?
The retina contains small blood vessels and nerve tissue that can be viewed directly during an eye exam. Eye doctors already use retinal exams to look for signs of conditions such as diabetes and high blood pressure.[journals.plos]
Because the eye and heart share blood-vessel and circulatory pathways, researchers are studying whether retinal changes may reflect broader vascular or neurological effects of AFib. But the exact reasons for the association are still unclear.[journals.plos][journals.plos]
Can an Eye Scan Diagnose AFib?
No. A retinal scan or OCT scan cannot diagnose AFib. It also cannot replace an ECG, heart-rhythm monitor, or assessment by a clinician.[journals.plos][nhs][ahajournals]
At present, retinal imaging may be a promising research tool. Before it could be used for screening, researchers would need to confirm that it improves detection, avoids false alarms, works across diverse populations, and leads to better health outcomes.[journals.plos][journals.plos]
What You Can Do Today
Keep up with eye exams
Regular eye exams are important for vision and can sometimes reveal signs of diabetes, high blood pressure, or other health conditions. But they are not a substitute for heart-rhythm screening.[journals.plos]
Know your risk factors
AFib risk increases with age and may be higher with high blood pressure, obesity, diabetes, sleep apnea, excessive alcohol use, heart disease, or a family history of AFib. Discuss your personal risk with a clinician.[heart][mayoclinic]
Notice heart-rhythm symptoms
Seek medical advice if you have palpitations, an irregular pulse, unexplained fatigue, dizziness, shortness of breath, or chest discomfort.[nhs][mayoclinic]
Get emergency care for stroke symptoms
Call emergency services immediately for sudden facial drooping, weakness or numbness on one side, trouble speaking, vision loss, severe headache, or confusion. These can be signs of a stroke.
Key Takeaway: Doctor-Style Recommendation
Retinal imaging may eventually help researchers understand AFib risk, but it is not a screening or diagnostic test for AFib today. If you have palpitations, an irregular pulse, dizziness, breathlessness, or chest symptoms, ask a clinician about an ECG or heart-rhythm monitoring. If you have possible stroke symptoms, seek emergency care immediately.
Editorial Note
This article is for general educational purposes only and is not medical advice. It does not diagnose, treat, cure, or prevent any disease. Retinal findings should always be interpreted by an eye-care professional, and heart-rhythm concerns should be assessed by a qualified clinician. If you may be having a medical emergency, call your local emergency number.
References
- Huemer, J., et al. (2026). Atrial fibrillation and retinal imaging-based oculomics. PLOS Digital Health.[journals.plos][journals.plos]
- American Heart Association. What is atrial fibrillation?[heart][heart]
- Centers for Disease Control and Prevention. About atrial fibrillation.[cdc]
- NHS. Atrial fibrillation.[nhs]
- Mayo Clinic. Atrial fibrillation: Symptoms and causes.[mayoclinic]
- 2023 ACC/AHA/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation.[ahajournals]