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玻璃体(Vitreous body,Corpus vitreum)是一无色、透明、半流动的凝胶体,容积约4ml,殆占眼内容积的4/5,比重为1.0053～1.0089,屈光力为1.334。玻璃体主要由构成支架的玻璃体纤维(网)和充满于网眼中的玻璃体液组成。从生化学上,玻璃体的99%为水分,1%为固体成分,其中有高分子成分与低分子成分之分:前者主要为胶原纤维、可溶性蛋白和透明质酸;后者有葡萄糖、氨基酸、无机酸以及尿素、氧、钾、钠、氯等。玻璃体既无血管,又无神经和固定细胞。其营养系靠脉络膜血管供应。从生理学上,玻璃体具有:①通过和屈折光线;②维持眼球的形状与压力,防止视网膜脱离的作用。玻璃体的病理具有三个主要特征:①因玻璃体是透明的,一旦发生病变即可出
Vitreous body (Corpus vitreum) is a colorless, transparent, semi-mobile gel body, volume of about 4ml, accounting for 4/5 of intraocular volume, the proportion of 1.0053 ~ 1.0089, refractive power of 1.334. The vitreous consists mainly of the vitreous fibers (mesh) that make up the scaffold and the vitreous humor that fills the mesh. Biochemically, 99% of the vitreous body is water, 1% is a solid component, which has a high molecular weight and low molecular weight components: the former is mainly collagen fibers, soluble protein and hyaluronic acid; the latter with glucose, amino acids, Inorganic acids and urea, oxygen, potassium, sodium, chlorine and so on. The vitreous has neither blood vessel nor nerve and fixed cell. Its nutrition by the choroidal vascular supply. Physiologically, the vitreous has: ① through and inflection of light; ② maintain the shape and pressure of the eye to prevent the role of retinal detachment. The pathology of the vitreous has three main features: ① because the vitreous is transparent, once the lesion can be out