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 years. 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.
Symptoms of lazy eye
Signs and symptoms of lazy eye include:
An eye that wanders inward or outward
Eyes that appear to not work together
Poor depth perception
Squinting or shutting an eye
Abnormal results of vision screening tests
Sometimes lazy eye is not evident without an eye exam.
Causes of lazy eye
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.
Anything that blurs a child's vision or causes the eyes to cross or turn out may result in lazy eye. Common causes of the condition include:
Muscle imbalance (strabismus)
The most common cause of lazy eye is an imbalance in the muscles that position the eyes. This imbalance can cause the eyes to cross in or turn out, and prevents them from tracking together in a coordinated way.
Difference in sharpness of vision between the eyes (refractive anisometropia)
A significant difference between the prescriptions in each eye — often due to farsightedness but sometimes to nearsightedness or an imperfection on the surface of the eye called astigmatism — can result in lazy eye. Glasses or contact lenses are typically used to correct these refractive problems. In some children lazy eye is caused by a combination of strabismus and refractive problems.
Any problem with one eye — such as a cloudy area in the lens (cataract) — can deprive a child of clear vision in that eye. Deprivation amblyopia in infancy requires urgent treatment to prevent permanent vision loss. Deprivation amblyopia often results in the most severe amblyopia.
Risk factors for lazy eye
Factors associated with an increased risk of lazy eye include:
Small size at birth
Family history of lazy eye
Complications of lazy eye
Untreated, lazy eye can cause permanent vision loss. Lazy eye is the cause of permanent vision loss in 2.9% of adults.