Nummular keratitis, the identifying characteristic of all viral keratoconjunctivitis, a contagious viral infection of the eye, and Herpes Zoster Ophthalmicus infections, represents  the presence of anterior stromal infiltrate
Keratoconjunctivitis is inflammation ("-itis") of the cornea and conjunctiva. Nummular keratitis is a feature of viral keratoconjunctivitis. It is a common feature of adenoviral keratoconjunctivitis (an ocular adenovirus infection), as well as approximately 1/3rd of cases of Herpes Zoster Ophthalmicus infections. 
