Keratitis, Causes, Signs and Symptoms, Diagnosis and Treatment.

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Chapters

0:00 Introduction
0:29 Symptoms of Keratitis
0:51 Causes of Keratitis
1:13 Complications of Keratitis
1:42 Treatment of Keratitis
2:29 Prevention of Keratitis




Keratitis is a condition in which the eye's cornea, the clear dome on the front surface of the eye, becomes inflamed. The condition is often marked by moderate to intense pain and usually involves any of the following symptoms: pain, impaired eyesight, photophobia (light sensitivity), red eye and a 'gritty' sensation.[1] Viral
Dendritic corneal ulcer after fluorescein staining under cobalt blue illumination
Adenoviral keratitis of a 24-year-old woman

Herpes simplex keratitis (dendritic keratitis). Viral infection of the cornea is often caused by the herpes simplex virus (HSV) which frequently leaves what is called a 'dendritic ulcer'.
Herpes zoster keratitis, associated with herpes zoster ophthalmicus, which is a form of shingles.

Bacterial

Bacterial keratitis. Bacterial infection of the cornea can follow from an injury or from wearing contact lenses. The bacteria involved are Staphylococcus aureus and for contact lens wearers, Pseudomonas aeruginosa. Pseudomonas aeruginosa contains enzymes that can digest the cornea.[2]

Fungal

Fungal keratitis, caused by Aspergillus fumigatus and Candida albicans (cf. Fusarium, causing an outbreak of keratitis in 2005–2006 through the possible vector of Bausch & Lomb ReNu with MoistureLoc contact lens solution[3])

Amoebic

Acanthamoebic keratitis

Acanthamoeba keratitis

Amoebic infection of the cornea is a serious corneal infection, often affecting contact lens wearers.[4][5] It is usually caused by Acanthamoeba. On May 25, 2007, the U.S. Center for Disease Control issued a health advisory due to increased risk of Acanthamoeba keratitis associated with use of Advanced Medical Optics Complete Moisture Plus Multi-Purpose eye solution.[6]

Parasitic

Onchocercal keratitis, which follows Onchocerca volvulus infection by infected blackfly bite. These blackfly, Simulium, usually dwell near fast-flowing African streams, so the disease is also called "river blindness".[7]