Ocular larva migrans - "larvae can live in body for years"

I read that ocular larva migrans larvae (T. canis?) can live in the human body for years before finally taking up “residence” in the eye, where they can do considerable damage. And I’m wondering what they are spending the rest of those years doing? Just swimming about merrily in the bloodstream? What do they eat and do in the meantime? (Apparently if there are few enough larvae, the body’s immune system might let them be, but otherwise what are these larvae doing?)