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Strabismus

The eyes normally work as a team aiming in on the same spot. Strabismus (commonly known as crossed eyes) occurs when your eyes point in two different directions. This causes the brain to see two different images rather than one focused image as normal.

Cause
Often this problem is caused by an imbalance of the eye muscles. This misalignment often appears before the age of two but may develop as late as the age of six or even in adults. When strabismus occurs in children before the age of six, double vision usually doesn't occur because of the brain's ability to suppress one of the images. However, sustained suppression of an eye may lead to amblyopia (commonly referred to as lazy eye).