A congenital form of strabismus characterized by horizontal eye movement limitation, globe retraction and palpebral fissure narrowing in attempted adduction. It is caused by a failure of development of the abducens nerve and can lead to amblyopia.

An abnormal configuration of the lower lip such that it is turned outward i.e., everted, with the Inner aspect of the lower lip vermilion (normally opposing the teeth) being visible in a frontal view.