Nummular keratitis, the identifying characteristic of all viral keratoconjunctivitis, and Herpes Zoster Ophthalmicus infections, represents  the presence of anterior stromal infiltrate
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. It represents the presence of anterior stromal infiltrates. 
