You are correct. Immediate decompression w/ lateral canthotomy is 1st-line tx for retrobulbar hemorrhage, a vision-threatening emergency. Retrobulbar hemorrhage typically occurs secondary to facial trauma or a surgical procedure. Without prompt recognition and tx, the hemorrhage can expand and produce an orbital compartment syndrome leading to high intraocular pressure, optic nerve damage, and retinal ischemia due to compromised vascular flow. Permanent vision loss can occur w/in 1 to 2 h of total vascular insufficiency. Acetazolamide and ophthalmic beta blockers may be used as adjuncts to decompression.