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KERATITIS • It refers to the INFLAMMATION OF CORNEA • It is characterized by: • (A) Corneal Oedema • (B) Cellular Infiltration  • (C) Ciliary Congestion Acanthamoeba • It is a Pathogenic Free Living Amoeba. • Species:   1) A.castellanii                       2) A.culbertsoni                       3) A.polyphagia                       4) A.astromyx Acanthamoeba Castellanii is responsible for Acanthamoeba keratitis Morphology • It exists in two forms 1. Active Trophozoite form 2. Resistant Cystic form Life Cycle • Habitat :  Soil, Fresh water, Well water, Sea water, Sewage, Air • Infective Form : Both Trophozoites and cyst...

APPLIED ANATOMY Sclera forms the posterior five-sixth opaque part of  the external fibrous tunic of the eyeball. Its whole  outer surface is covered by Tenon’s capsule. In the  anterior part it is also covered by bulbar conjunctiva.  Its inner surface lies in contact with choroid with a  potential suprachoroidal space in between. In its  anterior most part near the limbus there is a furrow  which encloses the canal of Schlemm. Thickness of sclera varies considerably in different  individuals and with the age of the person. It is  generally thinner in children than the adults and in  females than the males. Sclera is thickest posteriorly  (1 mm) and gradually becomes thin when traced  anteriorly. It is thinnest at the insertion of extraocular  muscles (0.3 mm). Lamina cribrosa is a sieve-like  sclera from which fibres of optic nerve pass. Apertures. Sclera is pierced by three sets of apertures  (Fig. 7.1). 1. Post...