How Many People Develop Diabetic Retinopathy?

What are the Causes and Mechanism of Retinal Damage?

The cause is chronic high blood sugar, which damages the small blood vessels of the retina. The mechanism involves the blood vessel walls becoming weak, leading to microaneurysms (small bulges), leakage of fluid into the retina, and eventually, blockage of blood flow. This damage starves the retinal tissue of oxygen. The resulting widespread damage to the blood vessels and the retina is progressive and irreversible.

What are the Risks of Vision Loss and Long-Term Consequences?

The risks of vision loss are severe. The disease can lead to macular edema (swelling of the central retina) or proliferative retinopathy (the growth of fragile, abnormal new blood vessels that bleed easily and cause scarring and retinal detachment). These advanced stages are the primary cause of severe, permanent vision loss and blindness. Early detection through screening is the best defense against severe outcomes.

How Does Screening Prevent Blindness?

Screening prevents blindness by detecting subtle changes before the patient notices symptoms. A dilated fundus examination allows the eye doctor to find early signs of vessel leakage or bleeding. Prompt detection enables the patient to receive laser treatment or anti-VEGF injections, which halt the disease's progression and preserve sight.

What are the Current Screening Rates?

Screening rates vary globally but are often suboptimal. Studies show that in some developed areas, fewer than 60 percent of diabetic patients receive the recommended annual dilated eye examination. This lack of screening is a major factor in late-stage diagnosis, leading to increased vision loss.

What is the Role of Blood Sugar Control?

Blood sugar control plays the single most necessary role in preventing retinopathy. Aggressively maintaining blood glucose levels and blood pressure within a target range significantly slows the development and progression of the disease.