As we mentioned in the introduction, one of the first uses that doctors discovered for Botox was treating strabismus, a condition that affects both children and adults. Strabismus is caused by imbalances in the pair of muscles that move the eye from side to side. If one of those muscles is weaker, the stronger counterpart will pull the eye in opposite direction. As a result, one eye may turn either inward — a condition that sometimes is called being cross-eyed — or outward. Since the stronger muscle is always contracting, it can become permanently tight. As a result, people can have trouble with depth perception or experience double vision [source: Metcalf].
Botox doesn't offer a permanent solution, but it can provide some relief from the problem. A doctor will inject it into the stronger muscle, so that it relaxes and has a chance to recover. The effects last a few months before a patient needs another injection [source: Metcalf].
The American Academy of Ophthalmology's website describes Botox treatments as "an extremely safe and effective way of changing the position of the eyes."