Amblyopia, commonly known as lazy eye, is the eye condition noted by reduced vision not correctable by glasses or contact lenses and is not due to any eye disease. The brain, for some reason, does not fully acknowledge the images seen by the amblyopic eye. Amblyopia occurs in early childhood. When nerve pathways between the brain and an eye aren't properly stimulated, the brain favours the other eye. Amblyopia occurs in early childhood. When nerve pathways between the brain and an eye aren't properly stimulated, the brain favours the other eye.