Esotropia is a form of strabismus or crossed eyes, where one or both eyes turn inward. The issue may be constant or intermittent, which is one way doctors classify the ailment, in addition to the age of onset. The condition also is classified based on whether or not glasses can correct it.

1. Infantile Esotropia

More than 75% of infants are born with misaligned eyes. However, within the first three months of life, the eyes gradually align and become coordinated. Because the bridge of the infant’s nose is not developed fully it may cause the child to appear to have esotropia. This false appearance is called epicanthus. As the bridge narrows and more of the whites of the eyes are revealed, the eyes will appear normal. Infantile, or congenital, esotropia reveals itself if the child’s eyes have a large amount of inward turning. Infantile esotropia usually appears between two to four months after birth.

Esotropia in babiesteap / Getty Images