Marcus Gunn Phenomenon, also known as jaw-winking syndrome, is related to hypotropia and esotropia, and has symptoms including reflex, abnormal, lid retraction or lag and ophthalmoparesis. An important gene associated with Marcus Gunn Phenomenon is ZFHX4 (Zinc Finger Homeobox 4). Affiliated tissues include eye and heart, and related phenotypes are marcus gunn jaw winking synkinesis and strabismus