Pupillary dilatation in fractures of the floor of the orbit.

A sign involving pupillary dilatation preoperatively and postoperatively in fractures of the floor of the orbit is presented. Response to Pilocarpine 0.5% was immediate. This represents injury to the parasympathetic fibers in the nerve that travel to the inferior oblique muscle and interrupts the path of ciliary ganglion. This pupillary sign has been found so far in posterior orbital floor fractures.