Herpes simplex eye infections are eye infections caused by the herpes simplex virus; the same virus that can cause cold sores and genital herpes.
The infection can cause redness and pain in or around the eye and sensitivity to light (see Herpes simplex eye infections - symptoms for more information).
Some people with a herpes simplex eye infection do not have any noticeable symptoms.
Who is affected
Herpes simplex eye infections are quite common and usually affect the middle-aged. They affect around one to two people in every 1,000 in the UK.
Outlook
A herpes simplex eye infection is not usually serious, although you should see your GP immediately if you have symptoms. You may need to use eye ointment or drops to clear up the infection (see Herpes simplex eye infections - treatment).
In some cases, a herpes simplex eye infection can permanently affect your eyesight if you do not get it treated straight away.
Continue to next section: Symptoms of herpes simplex eye infections