Herpes simplex keratitis is a common corneal epithelial
infection in humans and felines. My answer will address treatment
of HSV-1 in humans and not feline herpesvirus (FHV). The best
treatment for herpes simplex keratitis is topical application of
the antiviral ganciclovir in the form of an ophthalmic gel.
Alternative treatments include trifluridine solution and vidarabine
ointment, but these are more likely to be cytotoxic to the
epithelium than the ganciclovir.