Hello and thanks for your question. Thankfully, most people who have cranial nerve VI palsies with resultant double vision do see an improvement and usually a resolution in their symptoms over 3-6 months time and don't end up needing surgery for this. However, if you do need surgery, it is usually done under general anesthesia. The eyeball is not actually cut into, but the muscles that move the eye are detached from the surface of the eye and re-attached at a different location on the eye to effectively straighten the eyes. Most people tolerate this surgery very well and it is usually very successful in getting someone to have no dioplopia in straight ahead gaze and down gaze (where we read). Your activity level is also not significantly altered after this surgery.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.