There are three major causes for<unk> . One possible cause is injury due to any kind of scratches by sharp or hard objects on the surface of the cornea.' The scratched area forms an opening in the cornea, allowing microorganisms to access the cornea and lead to infection. Contamination of contact lenses is another cause as fungi, bacteria and parasites, microscopic parasite acanthamoeba, in particular, could inhabit the surface of the carrying case of the contact lens. When placing the contact lens to one's eyes, invisible microorganisms may contaminate the cornea resulting in<unk> . An extended period of wearing contact lenses could also cause damage on the cornea surface, allowing the entry of microorganisms to the cornea. Other than contamination of contact lenses, contamination occurring in water could also cause<unk> . Especially in places like the ocean, rivers, lakes and hot tubs, massive amounts of bacteria, fungi, and parasites exist. When there is an injury on the cornea surface, contact with contaminated water could transfer unwanted microorganisms into the cornea resulting in<unk> . Virus and bacteria are sources of infection to the cornea. Herpes virus and bacteria that cause gonorrhea are some examples.
Peripheral ulcerative keratitis
Interstitial keratitis
Nummular keratitis
Neurotrophic keratitis
Lattice corneal dystrophy
Diffuse lamellar keratitis
Granular corneal dystrophy
Subepithelial mucinous corneal dystrophy