Herpes zoster ophthalmicus refers to re-activation of the varicella-zoster virus in the V1 branch of the trigeminal nerve with ocular involvement. The cutaneous vesicular rash appears typical of shingles and is restricted to a single dermatome without crossing midline. Patients may present with pain and paresthesia within the distribution of V1, fever, headache, or vision changes. The cornea may reveal a pseudodendrite, a mucous plaque that stains poorly and lacks epithelial erosion. Slit lamp examination may show findings of iritis with cells and flare of the anterior chamber.