الفهرس 
Anatomy and Physiology of the CorneaOnly 14 pages are availabe for public view
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Abstract
Infectious keratitis is an important preventable cause of monocular blindness worldwide. It is considered an ocular emergency that requires prompt and appropriate management to ensure the best visual outcome for the patient. The causative agents of infective keratitis frequently isolated are bacteria, fungi, viruses and parasites. Bacterial keratitis rarely occurs in the normal eye because of the human cornea’s natural resistance to infection. However, predisposing factors, including[[ contact lens wear, trauma, corneal surgery, ocular surface disease, systemic diseases, and immunosuppression, may alter the defense mechanisms of the ocular surface and permit bacteria to invade the cornea. Fungal keratitis is a widely distributed fungal infection of the cornea caused by a broad spectrum of filamentous fungi and yeasts, Aspergillus spp. and Fusarium spp. constitute the main parts of the causal agents. Patients with fungal keratitis usually complain of decreased visual acuity, redness, tearing, pain, photophobia, and secretion. The classic textbook description of fungal keratitis is a corneal ulcer with a dry raised necrotic slough surface, feathery margins, with presence of satellite lesions.Demonstration of fungal elements in microscopic examination besides the isolation of fungi in culture is the gold standard of laboratory diagnosis.