What is the name of this eye surgery?

I’m looking for information on a specific type of eye surgery but I can’t remember the name of it to look it up. I believe it’s where they go in and cut a nerve or something so that that eye is the same as the other eye. The reason for the surgery is for people who have diplopia (double vision) and/or amblyopia (lazy eye). Once that nerve or whatever is cut, the eye will focus and move the same as the other eye. Does anyone know what the name of this surgery is?