“Bring beer and chips. Tonight we’re going to crush them,” his friend texts as he’s already on his way to watch the game. So he makes a quick stop at the supermarket—he’s out of cigarettes too. Find a parking spot, dash in, dash out. On the way out, a small booth catches his eye: “Retinal scan in 30 seconds.” Curious, he steps inside. Sit down, look straight ahead, please. A wafer-thin beam of light sweeps across his eyes. Done. Seconds later, the screen displays the result: elevated risk of diabetes, atherosclerosis, and high blood pressure—along with recommendations on exercise, diet, and tips for quitting nicotine.
What seems futuristic has a solid scientific foundation. The retina is the only part of the brain that can be directly observed optically—and is therefore the most extensively studied. It lines the inside of the eye like wallpaper, threaded with the finest blood vessels embedded in transparent layers of nerve tissue. Light reaches the retina almost unhindered—only refracted by the eye’s clear media: cornea, aqueous humor, lens, and vitreous body—where it strikes this sensitive “photographic plate.” There, photoreceptors capture, sort, and transmit visual information to the brain.
In the past, retinal examination was limited to biomicroscopy: ophthalmologists inspected it directly using a light source and magnifying lens. Over time, additional methods were introduced. In the mid-20th century, retinal photography enabled documentation and systematic comparison for the first time. In the 1990s, optical coherence tomography (OCT) revolutionized diagnostics, producing micrometer-precise cross-sectional images of the retina in seconds—non-contact and painless, comparable to an ultrasound made of light. Later came OCT angiography (OCTA), which visualizes blood flow in the finest capillaries without the need for contrast agents.
Being able to directly observe living tissue—blood vessels and neuronal structures—measure it, and draw conclusions about overall health is possible only through the retina of the eye.
Oculomics
Oculomics uses the retina as a window into whole-body health. It is a young, interdisciplinary field of research that combines insights from ophthalmology, neurology, internal medicine, imaging, and artificial intelligence.
The retinal microvascular and neuronal systems are highly sensitive to change. As a result, signs of conditions such as diabetes, hypertension, cardiovascular risk, neurological diseases like multiple sclerosis and Alzheimer’s, or autoimmune disorders can become visible early on.
Modern screening approaches rely on biomicroscopy, OCT, and OCTA, increasingly supported in recent years by AI algorithms for pattern recognition and interpretation.
Looking Ahead – The Retina as a Personal Early-Warning System
In the future, a retinal scan could become as routine as having your blood pressure taken by a general practitioner. Payers and medical institutions are already evaluating pilot programs to integrate oculomics into preventive care. The vision is compelling: fast, low-cost, non-invasive early detection of diseases that are often diagnosed only at advanced stages.
For people with chronic conditions, oculomics could one day serve as a continuous monitoring tool. Retinal scans during routine visits would generate ongoing data, interpreted by AI models: Is a therapy working? Are changes progressing? Are there new, more effective treatment options or lifestyle recommendations?
Medicine that needs only a power outlet—not an entire clinic.
Portable OCT and OCTA devices are becoming smaller, more robust, more affordable, and easier to deploy. This opens up screening opportunities even in structurally weak or sparsely populated regions, where examinations could be performed by trained non-physician staff—an initial step toward improving medical care in areas where access is far from guaranteed.
What is still missing is the scientific evaluation of large datasets, the development of universally accepted standards, and the seamless integration of results into routine medical care.
Challenges of Data Security
Despite its enormous potential, oculomics faces challenges—particularly in terms of data protection. Retinal images are biometrically unique and can be clearly linked to individuals. Their storage, processing, and transfer are therefore subject to strict legal regulations, such as the General Data Protection Regulation (GDPR) in Europe. Clinical and commercial applications must ensure secure data infrastructures, anonymized analyses, and clearly defined consent processes to prevent retinal images and derived health profiles from being misused, stolen, or exploited for discrimination.
“Shit,” he thinks, glancing at the bag of beer bottles, cigarettes, and chips. He trudges thoughtfully back to the car. “We’ll win tonight—and tomorrow, yes, tomorrow, we’ll see.”