Tamir Denis sat in a Tel Aviv lab, watching blood vessels no wider than a human hair pulse on a screen—tiny rivers carrying clues to a person’s health, all visible without a single needle prick. What he and his team at Tel Aviv University, in collaboration with Sheba Medical Center, have developed could transform how the world screens for anemia: an AI system that analyzes 10-second videos of the eye’s conjunctiva to detect hemoglobin levels and red blood cell counts with 82.8% accuracy. For a condition affecting 30% of the global population—anemia—this noninvasive breakthrough could bring life-saving screening to places where labs and trained phlebotomists are scarce or nonexistent.
Anemia, often caused by iron deficiency, chronic disease, or pregnancy complications, is a silent burden across low-resource regions. Current diagnosis relies on blood draws, lab infrastructure, and time—luxuries not universally available. The Video-to-Vessels system, developed by Denis under the guidance of Prof. Haim Suchowski, Prof. Lior Wolf, Prof. Ygal Rotenstreich, and Dr. Ifat Sher-Rosenthal, sidesteps these barriers entirely. Using a 50x magnification RGB camera, the team recorded short videos of the conjunctival microvasculature in 224 participants, then trained an AI model to decode blood flow patterns linked to hemoglobin and red blood cell levels. The most precise data came from the thinnest vessels, where red blood cells travel in single file, offering a clear signal of concentration and flow.
The technology’s precision hinges on more than just imaging—it’s in the processing. By stabilizing for eye movement and filtering digital noise, the researchers boosted predictive accuracy significantly. Without these steps, correlation with lab results dropped by 38% for hemoglobin and 19% for red blood cell counts. This attention to detail turned subtle flickers in tiny vessels into reliable physiological insights. The findings, published in npj Digital Medicine, mark a leap from anatomical observation to functional diagnostics—proving that the eye, long considered a window to the soul, may also be a mirror of blood health.
While still a proof of concept, the team envisions a future where a handheld device, no larger than a smartphone, could deliver rapid anemia screening in clinics, schools, or remote villages. No needles. No labs. Just a quick glance. As Denis puts it, “One of the things that fascinated us most is the fact that such a small, accessible part of the body can reveal so much about systemic health.” This isn’t just about replacing a blood test—it’s about reimagining access. For millions who go undiagnosed simply because a clinic is too far or a needle too intimidating, the quiet pulse of a microvessel in the eye might one day speak volumes.