A common vision problem in children is amblyopia, or "lazy eye." It is so common that it is the reason for more vision loss in children than all other causes combined. Amblyopia is a decrease in the child’s vision that can happen even when there is no structure problem with the eye. The decrease in vision results when one or both eyes send a blurry image to the brain. The brain then “learns” to only see blurry with that eye, even when glasses are used. Only children can get amblyopia. If it is not treated, it can cause permanent loss of vision.