Herpes of the eyes, also known as ocular herpes, is caused by the same herpes simplex virus that is largely responsible for cold sores and fever blisters. It is the single most common infectious cause of corneal blindness in America. Ocular herpes typically causes painful sores on the eyelid or cornea, and can eventually cause the cornea itself to inflame, which can lead to the breakdown and destruction of cells within the cornea, causing scarring and blindness. Though the virus itself never leaves the body, breakouts can be controlled and treated with prescriptions.