This 12-year-old girl presents as shown above.  She has minimal lens opacities and visual acuity of OD 20/40 and OS 20/30 without correction.

1.	The most likely diagnosis in this case is: d --  This child has the unmistakable features of Hallermann-Streiff syndrome.  Hypertelorism is characterized by an increased inter-orbital distance.  Goldenhar syndrome is characterized by hypodevelopment of the jaw (hemifacial microsomia), pretragle skin tags, epibulbar dermoids and lid colobomas.  Treacher-Collins syndrome (mandibulofacial dysostosis) is characterized by anti-mongoloid palpebral fissure, deformity of external ear, hypoplasia of the malar bone, and coloboma of the lower lid.
2.	This syndrome occurs:  d --  This syndrome occurs sporadically.
3.	In considering school placement, the child's mental ability should be considered as:  a -- In spite of the remarkable appearance of children with Hallermann-Streiff syndrome, they have normal intelligence and can be expected to live a normal life span.