Diabetes is slowly becoming one of the leading causes of blindness in India, as a person suffering from diabetes is at risk of diabetic complications related to various body organs such as eyes, kidneys and nervous system. Diabetes refers to a complex metabolic disease that impairs the power of the pancreas to produce insulin, resulting in high blood sugar levels. The incredibly small blood vessels behind your eyes can become damaged over time by high blood sugar levels. Fluid leaks from the vessels result in swelling, high pressure, and other problems.