Traumatic Nontraumatic Periorbital Eyelid hematoma, edema from trauma Cornea and conjunctiva Cortex Chemical burns, thermal burns, ultraviolet or infrared burns, laceration of cornea Traumatic iritis, hyphema, posttraumatic cataract, dislocation of lens, glaucoma Vitreous hemorrhage Severed retinal artery, retinal tears or detachment, commotio retinae Head trauma Orbital or periorbital cellulitis, tumor, allergic edema Conjunctivitis (bacterial, viral, fungal) Other Carotid artery trauma Anterior chamber Posterior chamber Retina Acute iritis, glaucoma, uveitis Endophthalmitis Retinal vein or artery obstruction, spontaneous Optic neuritis, toxins, hysteria, hypoglycemia, leukemia, cerebrovascular accidents, migraine, multiple sclerosis, acute disseminated encephalomyelitis, meningitis, encephalitis, seizure, cerebral venous sinus thrombosis, idiopathic intracranial hypertension, posterior reversible encephalopathy syndrome Poisoning Shunt malfunction Vitamin A deficiencies Measles Neoplasm