...a nonzero departure angle would only be problematic for the arc of contact theory were it sufficiently different from 0° to materially affect the mechanics of ocular rotation. Despite wrapping around the globe for some distance posterior to their insertions, the tendon bulk produced a nonzero departure angle for all extraocular muscles, violating the fundamental premise of the arc of contact model. Funding/Support: This work was supported by the U.S. Public Health Service, National Institutes of Health grant EY008313, and an unrestricted grant from Research to Prevent Blindness to the Department of Ophthalmology at University of California, Los Angeles, USA.