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Yes- eye muscle surgery is a very good option for adults. Most often it is permenant, although in rare cases, the muscle can slip and needs to be reoperated on. The benetfits are
Botox is also an option. It can either be used alone or in conjunction to eye muscle surgery. keep in mind though, Botox only last 3-4 months and so this is temporary. However, for certain causes of "crossed eyes" it is a very good treatment.
Eye muscle surgery is permenant and depending on what type of sutures are used (adjustable or non) they can be adjusted to give you maximal benefit. In this type of surgery, muscles of the eye are either moved forward or further back to allow the eye to move in all direction. Sometimes one eye is operated on, sometimes both depending on what the cause of the crossed eyes are.