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Scleral ring The appearance of a white patch of sclera adjacent to the optic disc when the retinal pigment epithelium and the choroid do not extend to the optic disc. The thicker the air film separating the two surfaces the greater the number of concentric rings. Newton's ring's Circular, concentric interference fringes surrounding a point of contact when two glass surfaces are pressed together. It has a brown or greyish-green colour to the unaided eye or golden brown to reddish colour when viewed through the slit-lamp and appears in nearly all cases of Wilson's disease. Kayser-Fleischer ring A ring of pigment granules containing copper located in Descemet's membrane around the periphery of the cornea. It is not always present in that disease.
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See iron line.įleischer's ring A narrow ring of brownish or greenish pigment containing iron, deposited in the epithelium of the cornea and surrounding (completely or partially) the base of the cone in keratoconus. It is composed of a deposition of iron, possibly located at the site of a previous foreign body injury. See direct gonioscopy Axenfeld's syndrome Rieger's syndrome.Ĭoat's white ring A small, oval or circular, whitish-grey ring opacity in the cornea found at the level of Bowman's layer, usually near the periphery. If it is unusually thickened or prominent, it is called posterior embryotoxon. Any line, object or structure that is circular in shape.Īnterior limiting ring of Schwalbe A bundle of connective tissue and elastic fibres forming the junction between the anterior termination of the trabecular meshwork and Descemet's membrane of the cornea.