Herpes simplex virus keratitis is caused by herpes simplex virus.

Herpes simplex keratitis is caused by viral infection.

If the patient is infected with herpes simplex virus, the virus enters the trigeminal ganglion that governs the eyes through the mouth, and the body cannot completely virus and enter the incubation period. If the human body overuses the eyes, is exposed to sunlight for a long time, fatigue, fever, etc., it will lead to low immunity, and the virus will be activated again, thus causing herpes simplex keratitis.

After diagnosis, the patient can be treated with antiviral drugs, such as acyclovir tablets, famciclovir tablets, valciclovir hydrochloride tablets, etc.