Amblyopia, commonly known as lazy eye, is an impairment of vision that occurs when the nerve pathway from one eye to the brain does not develop normally in childhood, usually caused by an eye turning inward or outward or one eye having significantly better focus than the other. It is the most common vision problem in children affecting ages 1-10. While full recovery is difficult after age 8, treatment through patching the good eye or applying eye drops can improve vision.