First Time User? Enroll now.
COVID-19: Vaccine information, visitor restrictions, and additional resources | Medicaid: The program is changing and you must take steps to keep your UNC Health providers
Home > Health Library > Strabismus
Strabismus (say "struh-BIZ-mus") is a vision problem in which both eyes do not look at the same point at the same time. Strabismus most often begins in early childhood. It is sometimes called crossed-eyes, walleye, or squint.
Normally, the muscles attached to each eye work together to move both eyes in the same direction at the same time. Strabismus occurs when the eye muscles don't work properly to control eye movement. When the eye muscles don't work as they should, the eyes may become misaligned and the brain may not be able to merge what one eye sees with what the other eye sees.
A child rarely outgrows strabismus after it has developed. Without treatment, strabismus can cause permanent vision problems. For example, if the child is not using one eye because it is misaligned, he or she can develop poor vision in that eye (called lazy eye or amblyopia).
Having strabismus can be hard on your child's self-esteem. It affects your child's appearance as well as his or her ability to see well. Other kids may tease your child for being cross-eyed or having a walleye. Be supportive of your child, and seek treatment right away.
Childhood strabismus often has no known cause, although it tends to run in families.
Sometimes strabismus develops when the eyes compensate for other vision problems, such as farsightedness or a cataract. Other things that can increase your child's risk for strabismus include an illness that affects the muscles and nerves, premature birth, Down syndrome, a head injury, and other problems.
Adults may develop strabismus from eye or blood vessel damage. Loss of vision, an eye tumor or a brain tumor, Graves' disease, stroke, and various muscle and nerve disorders can also cause strabismus in adults.
The most common signs of strabismus are:
An older child may also complain about blurred vision, tired eyes, sensitivity to light, or double vision.
Symptoms may come and go. They may get worse when your child is tired or sick.
A newborn's eyes may be misaligned at first. But the eyes should become aligned by 3 to 4 months of age. In some cases, the eyes may simply seem to be misaligned because the child has a wide bridge of the nose that creates the appearance of crossed eyes. But if your child's eyes aren't aligned all of the time after age 4 months, take your child to the doctor for an eye exam.
A doctor can often tell that a child has strabismus just by looking at the child's eyes. It may be obvious that the eyes don't look in the same direction at the same time.
The doctor may have the child look at an object while covering and then uncovering each eye. This allows the doctor to see which eye turns, how much it turns, and under what circumstances the abnormal turn occurs. These tests will also help the doctor find out if the child has amblyopia (lazy eye), which sometimes occurs with strabismus.
Experts recommend that children have regular eye exams. Vision tests may also be done to look for strabismus.footnote 1, footnote 2 If you have concerns about your child's eyes or vision, call your child's doctor, or take him or her to an eye doctor.
The most common treatments for strabismus are:
Other treatments may include medicines and eye exercises.
Treatment for strabismus should begin as soon as possible. In general, the younger the child is when treatment begins, the better the chances are of correcting the problem.
It's also important for your child to get follow-up exams.
U.S. Preventive Services Task Force (2017). Vision screening in children aged 6 months to 5 years: U.S. Preventive Services Task Force recommendation statement. JAMA, 318(9): 836-844. DOI: 10.1001/jama.2017.11260. Accessed August 6, 2018.
American Academy of Pediatrics, et al. (2016). Policy statement: Visual system assessment in infants, children, and young adults by pediatricians. Pediatrics, 137(1): 28–30. DOI: 10.1542/peds.2015-3596. Accessed March 6, 2017.
Current as of:
April 29, 2021
Author: Healthwise StaffMedical Review: John Pope MD - PediatricsAdam Husney MD - Family Medicine
Current as of: April 29, 2021
Author: Healthwise Staff
Medical Review:John Pope MD - Pediatrics & Adam Husney MD - Family Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2021 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
1505 SW Cary Parkway
REX Healthcare of Cary, Suite 210
Cary, NC 27511
2076 NC Highway 42 W.
Johnston Professional Plaza, Suite 100
Clayton, NC 27520
781 Avent Ferry Road
REX Healthcare of Holly Springs, Suite 212
Holly Springs, NC 27540
4414 Lake Boone Trail
REX Medical Plaza, Suite 505
Raleigh, NC 27607
910 Berkshire Road
Smithfield, NC 27577