News|Articles|October 27, 2026

Retinal imaging as a window into atrial fibrillation

Key Takeaways

In more than 90,000 people across TWO independent cohorts, those with atrial fibrillaion (AF) had a thinner macular ganglion cell–inner plexiform layer (mGCIPL) and inner nuclear layer than those without AF.
Retinal changes may come before diagnosis. participants without baseline AF, each 1-standard deviation decrease in mGCIPL thickness was associated with a 27% higher hazard of developing AF over a mean of 4 years. * Participants with AF showed narrower retinal venular caliber, lower venular fractal dimension, and higher arteriolar fractal dimension.

Patients with atrial fibrillation (AF) had measurable structural retinal changes in a large international study.

A large international study reported that patients with atrial fibrillation (AF) had measurable structural changes in the retina, according to first author Josef Huemer, MD, and colleagues who reported their results in PLOS Digit Health.¹ The study, which included more than 90,000 individuals from two large, independent cohorts, showed that patients with existing AF had a thinner macular ganglion cell inner plexiform layer (mGCIPL) and a thinner macular inner nuclear layer (mINL) than people without AF. The patients with AF also differed from those without AF on several retinal vascular indices. Huemer is the study lead author and affiliated with NIHR Moorfields Biomedical Research Centre, the Institute of Ophthalmology, University College London, both in London, and the Department of Ophthalmology and Optometry, Kepler University Hospital, Linz, Austria.

AF, a common cardiac condition expected to further double in prevalence over the next two decades,² contributes to several complications such as ischemic stroke, myocardial infarction, vascular dementia, and mortality.³ However, diagnosing AF can be tricky because it occurs sporadically on an electrocardiogram (ECG). “The likelihood of AF detection depends on aligning symptoms with ECG-based monitoring, but AF episodes themselves do not directly relate to thromboembolic outcomes.³ Rather, AF is a thrombo-inflammatory condition closely associated with underlying vascular disease. Appropriate use of established therapy, including direct oral anticoagulants and modulators of vascular disease, have the potential for substantial public health impact, if earlier diagnosis of AF can be achieved across broader communities,²” the investigators explained.

The investigators wanted to determine if the retina could offer information about a person’s cardiac health. They rationalized that “because the retina shares structural and vascular similarities with the brain and heart, changes visible on routine eye scans may reflect broader changes occurring elsewhere in the body.”¹

Analyzing the retina

They conducted a cross-sectional and longitudinal analysis using data from two independent cohorts: AlzEye (retrospective, age ≥ 40 years, 2008–2018; 50,561 patients) and UK Biobank (UKB) (prospective, age 40–69 years, recruited 2006–2010; 39,539 patients). Retinal sublayer thicknesses and retinovascular indices were obtained, respectively, from macular optical coherence tomography and color retinal photography. The occurrence of AF was determined by patient reports and hospital admissions.

The two cohorts were similar in that participants with AF were older on average than those without AF. They were also more likely to be males with hypertension and diabetes mellitus. Most notably, they were far more likely to have experienced a prior major adverse cardiovascular event.

What the analysis showed

The AlzEye database, which showed an 11% prevalence of AF, indicated that AF was associated with significantly smaller retinal venular caliber and thinner macular retinal nerve fiber layer, ganglion cell-inner plexiform layer, INL, and photoreceptor layer. The venular fractal dimension was lower, but the arteriolar fractal dimension was higher in individuals with AF.

The UKB database also was characterized by thinner mGCIPL. In UKB (n = 39,013 baseline without AF), 1.3% developed AF over a mean of 4.0 years. Adjusting for sociodemographic, clinical and lifestyle factors, each standard deviation decrease in the mGCIPL thickness was associated with a significant 27% increased hazard of AF.

When all the results were considered together, they suggested that retinal morphology, assessed with routine imaging, carries information about a patient's AF status. The mINL result was a new finding. The investigators explained that while thinning of the mGCIPL has a plausible link to AF-related microvascular injury, the reduced mINL thickness had not previously been described in this setting.

The authors suggest that there is “potential for non-invasive retinal imaging to provide early detection and risk stratification of AF, as well as an easily accessible opportunity to understand AF pathophysiology and directly assess end-organ damage. Given the widespread availability of retinal imaging in primary care optometrist [offices] across developed nations, further attention is warranted to explore the role of retina imaging for earlier diagnosis of AF, and the opportunity to target therapy addressing underlying vascular disease to reduce the large patient and healthcare burdens associated with AF.”

Huemer commented: “These results show that a common heart condition that is notoriously difficult to diagnose leaves visible traces in the retina, which can be captured with quick, non-invasive eye scans. Our next step is to use multimodal imaging to build stronger evidence for a causal link. Ultimately, future studies will need to establish whether earlier detection translates into better outcomes for patients.”