Diabetes is the number one reason for reversible blindness. Blood vessels in the retina may swell and leak fluid. New vessels may be weak or may grow on the surface of the retina. This makes yearly eye check up mandatory for the diabetic patients.

Glaucoma is the second leading cause of blindness and the leading cause of irreversible blindness worldwide. According to WHO, 4.5 million people are blind due to glaucoma around the world.

A cataract is a clouding of the lens in the eye which leads to a decrease in vision. Cataracts often develop slowly and can affect one or both eyes. Symptoms may include faded colors, blurry vision, halos around light, trouble with bright lights, and trouble seeing at night.

45% of blind children were blind from avoidable causes
Such as: Corneal scarring (mainly from Vitamin A deficiency and measles), Childhood Cataract, Retinopathy of prematurity, Refractive error (mostly myopia), and low vision are reasons that can be avoided.