Lazy eye (amblyopia) is reduced vision in one eye caused by abnormal visual development early in life. When nerve pathways between the brain and an eye aren’t properly stimulated, the brain favors the other eye. 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. Early diagnosis and treatment can help prevent long-term problems with your child's vision.
Signs and symptoms
o An eye that wanders inward or outward
o Eyes that appear to not work together
o Poor depth perception
o Clumsiness. Poor gross motor coordination may be related to lazy eye. The visual system leads the way in gross and fine motor development.
o Squinting or shutting an eye
o Head tilting
o Abnormal results of vision screening tests
When to see a doctor
See your child's doctor if you notice his or her eye wandering at any time after the first few weeks of life. Sometimes lazy eye is not evident without an eye exam.
A vision check by age 3 by a pediatric ophthalmologist is especially important if there's a family history of crossed eyes, childhood cataracts or other eye conditions. It's important for your child to be monitored for recurrence of lazy eye — which can happen in up to 25 percent of children with the condition. If lazy eye recurs, treatment will need to start again. For all children, a complete eye exam is recommended between ages 3 and 5.
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.
• Deprivation. 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.
Factors associated with an increased risk of lazy eye include: premature birth, small size at birth; family history of lazy eye; or developmental disabilities.
Treatment includes eye patches, drops, glasses or contact lenses, and sometimes surgery. For most children with lazy eye, proper treatment improves vision within weeks to several months. Treatment might last from six months to two years. Untreated, lazy eye can cause permanent vision loss. Lazy eye is the cause of permanent vision loss in 3 percent of adults.