What are the most common diseases that causes blindness in children?

Childhood blindness: Causes of childhood blindness differ from adults causes, and differ on a worldwide scale compared to causes, say, in the U.S. Worldwide causes include vitamin a deficiency, measles, retinopathy of prematurity, newborn conjunctivitis, and congenital cataract. Other causes include uncorrected refractive error, strabismus and amblyopia (lazy eye), retinoblastoma, and lebers congenital amaurosis.