<unk>  is due to reactivation of VZV within the trigeminal ganglion. The trigeminal ganglion give rise to the three divisions of cranial nerve V (CN V), namely the ophthalmic nerve, the maxillary nerve, and the mandibular nerve. VZV reactivation in trigeminal ganglion predominantly affects the ophthalmic nerve, for reasons not clearly known. The ophthalmic nerve gives rise to three branches: the supraorbital nerve, the supratrochlear nerve, and the nasociliary nerve. Any combination of these nerves can be affected in<unk> , although the most feared complications occur with nasociliary nerve involvement, due to its innervation of the eye. The supraorbital and supratrochlear nerves mainly innervate the skin of the forehead. The frontal nerve is more commonly affected than the nasociliary nerve or lacrimal nerve.
Herpes zoster ophthalmicus
Sympathetic ophthalmia
Ocular larva migrans
Vertigo
Oropouche fever
Adenoviral keratoconjunctivitis
Ocular rosacea
Herpes simplex keratitis