[Acute compression of the optic nerve due to orbital emphysema].

Bony defects of the orbit with connection to the paranasal sinuses can lead to orbital emphysema. A case of compression of the optic nerve due to orbital emphysema in a 39-year-old man is reported. Visual acuity was hand movements only and intraocular pressure was increased to 32 mm Hg with an exophthalmus of 6 mm in comparison to the unaffected side. A sufficient pressure relief could be achieved by canthotomy with cantholysis and radial peritomy.