While I don't know or understand all the details at this point, a friend who is a 4th year was telling me about a young girl they had as a patient who had an issue with her right eye (always turned laterally) who had seen Ophtho after ophtho and even had a procedure done to help bring it in.
Supposedly, at their hospital they started treating her with cranial OMT (don't know exactly what sparked their decision to treat that with cranial, as I'm a noob and don't actually know anything about OMT yet.) and within a few weeks of treatment, her problem was corrected. In fact it was TOO corrected, as the eye was now looking slightly medially. The ophtho who did the initial procedure has to reverse what he had done and the girl now has to normally functioning eyes.
I wish I had more details, but he was just telling me about it in a conversation because I asked about cranial (since everyone on SDN says it's a load of crap) and he gave me that as an example. He did also include that he has never seen another use or application for cranial. It was just right for that one instance for that one patient. He just said each technique in OMT has its purpose, and some techniques can only really help with a few small things that you'll rarely actually see.