During the H-test, the patient is holding his head down and tilted to the right. It is as if the impaired muscle was, in fact, pulling on his head in the way it usually pulls on the posterior aspect of the eyeball. If we move the patient's head to a horizontally and vertically level position, the ocular palsy becomes apparent. Which muscle appears to be unopposed in the right eye? What is its paired muscle that is not working, and hence which nerve? Click continue for the answers and for another diplopia scenario.