 All right. That's pretty cool. It enables you to refocus your eyes then is what it does. For sure, but it gets better from there. It wouldn't matter if your eyes can't change focus because if you had no ciliary body, your eyeball would shrivel up like a prune and would not function. The eye would be blind because the ciliary body secretes aqueous humor at just the right rate to sustain normal eye pressure. Too much and you have glaucoma, too little, prune time.