Herpes zoster opthalmicus is the reactivation of varicella zoster in the area supplied by the opthalmic division of the trigeminal nerve.
It occurs in roughly 10% of cases of shingles.
There may be Hutchinson's sign = rash on the tip of nose, which indicates nasocillary involvement and is a strong risk factor for ocular involvement.
Treatment is oral antivirals for 7 to 10 days and urgent opthalmic review if there is ocular involvement.
On to the final revision battle of the day...
