Strabismus, more commonly known as cross-eyed or wall-eyed, is a vision condition in which a person can not align both eyes simultaneously under normal conditions. One or both of the eyes may turn in, out, up or down.
Strabismus usually develops in infants and young children, most often by age 3, but older children and adults can also develop the condition. There is a common misconception that a child with strabismus will outgrow the condition. However, this is not true. In fact, strabismus may get worse without treatment. Any child older than four months whose eyes do not appear to be straight all the time should be examined.
When eyes are misaligned, the straight or straighter eye becomes dominant. The vision strength (acuity) of the straight eye remains normal because the eye and its connection to the brain are functioning as they should. The misaligned or weaker eye, however, does not focus properly and its connection to the brain is not formed correctly.