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Ency. home > Disease > S > Strabismus

Strabismus    See images

Overview | Symptoms | Treatment | Prevention

Alternative names:

Crossed eyes; Esotropia; Exotropia; Squint; Walleye

Definition:

A condition of abnormal deviation of alignment of one eye in relation to the other.

Causes and Risks

Strabismus is caused by a lack of coordination between the eyes, causing the eyes to point in different directions. The eyes do not focus simultaneously on a single point.

Most cases of strabismus in children are of unknown cause. More than half are present at or shortly after birth (congenital strabismus). Strabismus in children is frequently associated with amblyopia, or lazy eye. Children with esotropia, or eyes turning in, are often farsighted. Strabismus in children may also occur in cerebral palsy, or in children who have diminished vision from any other cause.

Acquired strabismus in adults may result from injuries to the orbit or brain, including closed head injuries and strokes. Persons with diabetes often have loss of circulation to muscle which turns the eye outward, causing an acquired paralytic strabismus. Loss of vision in one eye from any cause will usually cause the eye to gradually turn outward (exotropia).

Some of the disorders that can be associated with strabismus in children include:

Some of the disorders that can be associated with strabismus in adults include:

When the two eyes look in different directions, the brain of children may learn to ignore the image from one of the eyes. If this continues, it may become permanent, and the eye which the brain ignores will never see well. This loss of vision is called amblyopia. This does not happen when new strabismus happens in an adult.

A family history of the disease is a risk factor. Farsightedness may be a contributing factor. Any other disease causing visual loss may result in strabismus as a complication.

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