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沿视神经乳头边缘的色素增多称为脉络膜环或新月形弧,是视网膜色素上皮未抵达视乳头边缘所显露的部位。通常是由于视神经斜入所致,如近视眼。另一些病例,暗黑的色素环或弧是由于视网膜色素上皮的增殖或由于色素上皮边、玻璃膜及脉络膜延伸到巩膜孔上所致。不规则的色素沉着也可能由于视乳头邻近的脉络膜炎或变性所致。本文描述另一种不同于上述类型视乳头色素弧的重要性及临床特征。一例男性黑人47岁,眼压右32mmHg,左眼31mmHg,眼前节正常,视乳头凹陷大而对称,宽的青灰色新月形弧位于视乳头颞侧及颞下方边缘,并有暗黑的色素在灰色弧的周围。视乳头凹陷
Increased pigment along the edge of the optic nerve is called the choroid ring or crescent-shaped arc, is the retinal pigment epithelium did not arrive at the edge of the optic disc revealed the site. It is usually due to oblique optic nerve, such as myopia. In other cases, the dark pigment ring or arc is due to the proliferation of the retinal pigment epithelium or due to the pigment epithelium edge, the glass membrane and choroid extending to the scleral hole caused. Irregular pigmentation may also be due to choroiditis or degeneration adjacent to the optic nerve. This article describes another important and clinical feature that is different from the above type of papilla. A male black 47 years old, intraocular pressure right 32mmHg, left eye 31mmHg, anterior segment normal, large and symmetrical optic disc depression, the wide blue crescent-shaped arc is located in the temporal and temporal underside of the optic nerve and dark pigment in Around the gray arc. Depression of the optic nerve