An orbital
blowout fracture is a traumatic deformity of the orbital floor or medial wall, typically resulting from impact of a blunt object larger than the
orbital aperture, or eye socket. There are two broad categories of blowout fractures:
open door, which are large, displaced and comminuted, and
trapdoor, which are linear, hinged, and minimally displaced. They are characterized by
double vision,
sunken ocular globes, and loss of sensation of the cheek and upper gums due to
infraorbital nerve injury.