AIM: To discover the common causes of the orbital blow-out fracture and the probability of occurrence and characteristics of eye injury.

METHODS:Totally 63 hospitalized cases of orbital blow-out fracture from January 2009 to March 2011 were retrospectively analyzed in Kowloon Hospital.

RESULTS: The causes of injury of 63 cases of orbital blow-out fracture, boxing injuries in 28 cases, traffic accident in 17 cases, ocular blunt trauma 9 cases, fall injury 5 cases, crash injury 2 cases, and the others two cases. 57 cases patients with eye injury, in which the eyelid subcutaneous ecchymosis, eyelid swollen in 45 cases; eyelid laceration 16 cases; subconjunctival hemorrhage 25 cases; corneal foreign body and epithelial defect, 9 cases; hyphema 5 cases; infraorbital nerve paralysis or sensory retard 4 cases; vitreous hemorrhage in 4 cases; optic nerve contusion in 3 cases; lacrimal canalicular break 2 cases; eyeball rupture in 2 cases; retinal tears 1 case; lens subluxation 1 case.

CONCLUSION: Boxing injury and car accident injury are the main causes of orbital blow-out fracture, boxing injury often causes simple orbital fractures, car accident injuries and blunt contusion easily lead to complex orbital fractures, and often associated with eye injury. In eye injury of the orbital blowout fracture, the highest incidence of eyelid injury, cornea, conjunctiva and anterior chamber angle injury is more common, more serious eye damage such as optic nerve damage, eye rupture, retinal tears are relatively rare.