Fungal keratitis is an infection of the clear outer surface of the eye (the cornea) caused by a fungus..
If not treated quickly and aggressively, fungal keratitis can lead to loss of vision or even loss of the eye itself. Without a pre-existing wound or ulcer, the presence of fungi is not normally a problem for the horse. However, when a corneal ulcer is present, organisms normally on the anterior surface of the eye can result in an infection. Infection of the cornea can be devastating due to the often aggressive nature of fungi and it is likely to result in two types of lesions, an ulcer or abscess.