Lazy eye (amblyopia) is reduced vision in one eye caused by abnormal visual development early in life. The weaker — or lazy — eye often wanders inward or outward.
Amblyopia generally develops from birth up to age 7. It is the leading cause of decreased vision in one eye among children. Rarely, lazy eye affects both eyes.
Early diagnosis and treatment can help prevent long-term problems with your child's vision. Lazy eye can usually be corrected with glasses or contact lenses, or eye patches. Sometimes surgery is required.
Sometimes lazy eye is not evident without an eye exam.
Lazy eye develops because of abnormal visual experience early in life that changes the nerve pathways between a thin layer of tissue (retina) at the back of the eye and the brain. The weaker eye receives fewer visual signals. Eventually, the ability of the eyes to work together decreases, and the brain suppresses or ignores input from the weaker eye.
Untreated, lazy eye can cause permanent vision loss. Lazy eye is the cause of permanent vision loss in 2.9% of adults.