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What is Strabismus?

Strabismus is a visual disorder in which the eyes are misaligned and point in different directions. It is a common condition among children that affects about 4% of all children in the United States. It can also occur later in life. When the eyes are misaligned, typically one eye fixates on an object while the other eye turns in (esotropia), out (exotropia), up (hypertropia), or down (hypotropia). When this occurs, two different images are sent to the brain, confusing it, and further resulting in the brain rejecting the image from the weaker eye. Therefore, abnormal eye alignment blocks normal vision development in children, inhibiting their ability to perform in school and necessary day-to-day activities.


Experts don’t completely understand the cause of this condition, but it results from eye muscles failing to work together. Idiopathic (resulting from an unknown cause) strabismus is the most common type. Other conditions can also cause it, including thyroid eye disease, nerve damage, and brain injuries. Risk factors include family history of strabismus, prematurity or low birth weight, retinopathy of prematurity, as well as conditions that affect vision, such as cataracts, severe ptosis and corneal scars.


Strabismus cannot be prevented. However, early diagnosis and proper treatment is essential to preventing vision loss resulting from amblyopia, also called “lazy eye”, and other complications stemming from strabismus. Children should be monitored closely during infancy and the preschool years to detect potential eye problems, especially if there is family history with strabismus. Regular screening for young children includes testing for strabismus using light reflex for infants and cover testing for preschool-aged children.

Treating Strabismus

Treatment can preserve vision, straighten the eyes, and restore binocular (two-eyed) vision.

After a complete eye examination, an ophthalmologist can recommend the appropriate treatment. In some cases, eyeglasses are prescribed. Other treatments may involve surgery to correct the unbalanced eye muscles, or the removal of a cataract. Covering or patching the strong eye is often necessary.

Beyond vision impairment, this condition has lifetime consequences. Many individuals become societal outcasts and have difficulty getting married or finding a job. So even when vision may not be improved, surgery can improve an individual’s chance at a normal life.

SEE International & Strabismus Around the World

Ophthalmologists are rare in the developing world, and many countries are in desperate need of trained eye surgeons.

SEE is working diligently to reduce the number affected by this condition around the world by:

  • Performing corrective surgeries
  • Connecting patients with local doctors
  • Training local eye care personnel in ophthalmology and surgical techniques
  • Strengthening local health care infrastructure

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