In herpes zoster opthalmicus least involved nerve is?
Facial REF: khurana 4th ed p. 126-127 Herpes zoster virus lies dormant in the gasserian ganglion of trigeminal nerve to appear later, paicularly in elderly people with depressed cellular immunity in distribution of trigeminal nerve Here all except facial nerve is branches of trigeminal nerve hence is the answer.
Facial
Infraorbital
Lacrimal
Nasociliary