葡萄膜(Uvea)又称眼球血管膜(vascular tunic)、色素膜,是眼球壁的中间层(外层为纤维膜,内层为神经膜),此膜像紫黑色、又圆又软的葡萄而得名,由疏松结缔组织构成,富含血管和色素,故也叫血管膜或色素膜。它由前部的虹膜、中部的睫状体和后部的脉络膜构成。其主要作用为产生房水、调节眼内压、供给眼球血液营养、排泄废物及有毒物质和遮挡光线作用。
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