Early eye screening can prevent 95% of diabetes-related blindness, experts urge

India is home to more than 100 million people living with diabetes—a staggering number that has earned the country an unwelcome distinction: the diabetes capital of the world. For most of these individuals, daily life centers on a single, relentless task: checking blood sugar. The glucometer becomes a constant companion. Diet is tracked, insulin is managed, and glucose levels are monitored with the kind of attention that survival demands. But medical experts are now pushing patients to look beyond the numbers on that small screen. While blood sugar control remains foundational to diabetes care, another critical dimension of the disease has been quietly overlooked until it becomes irreversible: what happens to the eyes.

Diabetic retinopathy—a condition in which persistently high blood sugar gradually damages the delicate blood vessels that nourish the retina—is one of the leading preventable causes of blindness in working-age adults. The numbers are sobering. Among India's diabetic population, 12.5 percent already have some form of retinopathy, and four percent have vision-threatening disease. For those with type 2 diabetes who have lived with the condition for 25 years, nearly one in four will develop the more severe proliferative form. In type 1 diabetes, the risk climbs to 50 percent after two decades. Yet here is where the story shifts from warning to possibility: with early detection and prompt treatment, the risk of severe vision loss can be cut by as much as 95 percent. The blindness that seems inevitable is, in fact, largely preventable.

The trap lies in the disease's deceptive silence. In its early stages, diabetic retinopathy causes no symptoms. A person can have perfect vision—the kind that passes any eye test—while tiny blood vessels in the retina are already weakening and leaking fluid. This absence of warning signs creates a dangerous illusion of safety. Patients assume that if they can see clearly, their eyes are fine. They postpone a visit to the ophthalmologist, waiting for a sign that never comes until the damage has advanced. By the time blurred vision, dark spots, or blank patches appear in the visual field, the condition has often progressed beyond the point where simple intervention works. The "wait and see" approach, in other words, is a trap disguised as common sense.

Another misconception compounds the problem: the belief that tight blood sugar control alone prevents eye disease. While managing glucose, blood pressure, and cholesterol does slow the disease's progression, it does not eliminate the risk. Time itself is a risk factor. The longer someone lives with diabetes, the higher the likelihood that retinal changes will occur. This is why annual screening is not optional—it is as essential as any other pillar of diabetes care.

The medical establishment is now working to make prevention accessible. Sun Pharma, in partnership with the Vitreo Retinal Society of India, has launched a nationwide campaign called #SeeBeyondSugar, designed to shift how people think about diabetes management. A centerpiece of this effort is technology that removes the friction from screening. Fundus-on-Phone is an AI-powered tool that can scan the retina in less than a minute, without requiring pupil dilation or lengthy appointments. It is non-invasive and produces immediate results. The campaign is organizing screening camps across 28 cities, transforming eye exams from something patients dread or postpone into a simple, quick item on a health checklist.

The path forward is straightforward. Medical experts recommend that people with type 1 diabetes have their first comprehensive eye exam within five years of diagnosis, then annually thereafter. Those with type 2 diabetes should have a retinal scan immediately upon diagnosis, followed by annual check-ups. The message is not one of fear but of agency. Diabetes is a serious condition, but blindness does not have to be its consequence. With awareness, the right technology, and a commitment to one simple scan each year, millions of Indians can preserve their sight and the life that sight makes possible.