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Aspergillus Keratitis

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Abstract

The cornea must be perfectly transparent to allow an individual to visualize his/her environment. Keratitis, an inflammation of the cornea that frequently arises due to infection, is a threat to corneal transparency. Species of Aspergillus may cause keratitis, especially in outdoor workers in agricultural communities in the developing world and in tropical and subtropical areas. Aspergillus keratitis frequently occurs following traumatic inoculation of Aspergillus conidia into the cornea through injury or surgical procedures, but other factors may also predispose to the infection. Aspergillus keratitis is a medical emergency, since the patient frequently presents with extreme pain and loss of vision, and needs to be recognized and treated promptly. A presumptive diagnosis of Aspergillus keratitis can be established by a careful clinical examination and by direct microscopic examination of stained smears of corneal scrape material. The diagnosis can be confirmed by culture. Other, more rapid methods of diagnosis such as confocal microscopy and molecular methods have also been described. For therapy, topical application of natamycin (5%) or amphotericin B (0.15%) drops is most widely used. Intracameral injection of amphotericin B is a recently described alternative to topical use. Itraconazole, as an oral preparation or ophthalmic solution, has also been successfully used. Recently, voriconazole, administered by different routes, has shown considerable promise for therapy. Surgical intervention includes debridement, lamellar keratectomy/keratoplasty, or a conjunctival flap and may be required in patients with deep lesions. Therapeutic penetrating keratoplasty may be the final resort for uncontrolled infection. A better understanding of the pathogenesis of Aspergillus keratitis may improve its outcome.

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Thomas, P.A. (2009). Aspergillus Keratitis. In: Comarú Pasqualotto, A. (eds) Aspergillosis: From Diagnosis to Prevention. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2408-4_57

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