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staphyloma
A staphyloma is an abnormal protrusion of the uveal tissue through a weak point in the eyeball. The protrusion is generally black in colour, due to the inner layers of the eye. It occurs due to weakening of outer layer of eye (cornea or sclera) by an inflammatory or degenerative condition.
It may be of 5 types, depending on the location on the eyeball (''bulbus oculi'').
== Anterior (corneal) staphyloma ==
In the anterior segment of the eye, involving the cornea and the nearby sclera. It is an ectasia of pseudocornea ( the scar formed from organised exudates and fibrous tissue covered with epithelium) which results after sloughing of cornea with iris plastered behind, it is known as anterior staphyloma.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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