The Cleveland Clinic

Strabismus

Introduction to Strabismus

Strabismus, also known as crossed eyes, is a condition in which the eyes don't look towards an object together. One of the eyes may look in or out, or turn up or down. The eye turning can occur all of the time or only sometimes, such as during stressful situations or illness.

What Causes Strabismus?

Some people are born with eyes that do not align in the usual way. This is called congenital strabismus. In many children, there is no clear cause of strabismus. In some cases, it is a result of a problem with the nervous system, especially the part that controls the muscles of the eyes. If it is not corrected, strabismus can continue into the adult years. Most adults who have strabismus were born with it.

If strabismus does not appear until later in life, it will cause double vision. If the eyes become misaligned in an adult who did not have strabismus as a child, it could be a sign of a serious condition such as a stroke. A sudden, misalignment of the eyes or double vision are important reasons to see a doctor immediately.

Someone who is born with strabismus will see without having double vision. There might be other effects on vision, however. Because the two eyes are not working well together, depth perception and peripheral vision (vision off to the side) will not be very good. Eyestrain and headaches can occur frequently. It might also be necessary to turn the head in unusual ways in order to see in certain directions.

How Is Strabismus Treated?

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A doctor may recommend that patients go through physical therapy to help strengthen their eye muscles. Vision therapy is also used to help a person correct their vision when suffering with strabismus. This therapy helps train a patient's brain to be able to align their eyes and focus and visually process images. Vision therapy uses computerized optical devises, including lenses and filters, to develop the eye muscles.

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