How is viral keratitis caused by: viral keratitis to herpes simplex keratitis as the most common, is a serious blinding eye disease, the pathogen is herpes simplex virus, when the patient’s body resistance is reduced, such as colds, fever, fatigue or serious mental stimulation susceptible to the development of the disease. The clinical manifestations of viral keratitis: 1. Primary infection: mostly in young children, with fever, swollen and painful lymph nodes in front of the ear, and skin herpes on the lips and nose. Ocular involvement is manifested as acute follicular conjunctivitis, skin herpes on the eyelids, when about 2/3 of patients develop punctate or dendritic keratitis, and less than 10% have keratoconjunctivitis and uveitis. 2, recurrent infection: when the body’s resistance is reduced is prone to occur. Corneal lesions can be punctate, dendritic, map-like ulcers, and in severe cases, corneal stromalitis, corneal melting, perforation, and corneal hyperalgesia in the lesion area. 3, ocular foreign body sensation, photophobia, lacrimation, and vision loss and other symptoms. 4, due to viral infection in the trigeminal ganglion latent, 1/3 of patients within 5 years. Repeatedly, it leads to corneal clouding, which seriously affects vision. The treatment of viral keratitis 1, local treatment: acyclovir, doxycycline and other eye drops. 2, systemic treatment: acyclovir, vitamin B, C application 3, surgical treatment: corneal transplantation: according to the condition of the choice of lamellar or penetrating corneal transplantation.