<prompt> Most common cause of fracture of roof of orbit:Blow on back of headBlow on parietal boneBlow on the foreheadBlow on the upper jaw  <response>: Orbital roof fractures are very rare as an isolated feature. They are most commonly seen in children following brow trauma. Oxford handbook of OphthalmologyFractures of the orbital roof among young children are probably far more common than traditionally has been recognized. There is usually a history of a blow to the brow. Head neck surgery--otolaryngology By Byron J. Bailey, Jonas T Johnson, Shawn D. Newland 4e p1346 