What kind of craniofacial defect is characterized by an abnormal distance in the bony orbits between the eyes?

a. Treacher Collins syndrome
b. Apert syndrome
c. Crouzon disease
d. Hypertelorism

ANS: D
This genetic defect can appear independently or as a result of a midline facial cleft and/or encephalocele. Problems with binocular vision and an absent sense of smell occur.