A. The Herpes Simplex Virus and Keratitis
Keratitis may occur as a result of an injury or damage, but the most common is reason is an infection. The most common being the Herpes Simplex Virus.
Quite often the individual contracted this virus in the past, perhaps in childhood and it has been dormant. Recurrence or reactivation of herpes in the trigeminal ganglion from its latent state, may occur because of fever or sunburn, trauma, or stress and marches down the nerve twigs which supply the eye, resulting in an episode of Herpes Infection of the Cornea.
Such infections have major blinding potential due to inflammation of the Cornea (Keratitis) and the high probability of scarring of the Cornea.
Early diagnosis and treatment with a potent anti-inflammatory significantly reduces the chance of permanent damage to the cornea.
CONTACT LENS ABUSE AND KERATITIS
Contact lens abuse and poor lens hygiene are also common causes of corneal inflammation via secondary infection.
B. Bacterial And Fungal Infections Can Cause Keratitis
Aside from herpes, bacterial and fungal infections can cause severe Keratitis requiring aggressive treatment and sometimes surgery.
Diseases which affect the eyelids, such as thyroid disease or rosacea, can lead to a compromised corneal surface, and secondary infection.
C. Severe Systemic Allergies
Severe Systemic Allergies involving the eyes can also involve inflammation of the cornea.
D. Autoimmune diseases and Keratitis
Autoimmune diseases, particularly those with components involving vasculitis, or inflammation of blood vessels, can cause inflammation around the outside edges of the cornea, known as peripheral Keratitis.
Auto-immune diseases, especially rheumatoid arthritis and types of vasculitis, can be a risk factor for developing keratitis and Dangerous Thinning Of The Cornea Which May Also Require Surgery.
E. Abnormal Eye Lid Function
Additionally, problems such as dry eye and abnormal eyelid function, which lead to poor corneal health, can lead to Keratitis by making the cornea more susceptible to infection or other types of inflammation.