By definition a cataract is an opacity in the lens . 白内障的定义就是晶状体混浊。
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Opacity of the lens is readily visible, especially in advanced cases . 晶状体的混浊易于识别，特别是在晚期病例。
3.
The cells of this epithelium exhibit many interdigitations with the lens fibers . 这种上皮细胞同晶状体纤维呈现许多相嵌连接。
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The ciliary body is an anterior dilation of the choroid at the level of the lens . 晶状体是脉络膜石晶状体平面上向前扩大的部分。
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This is made possible by the action of the crystalline lens and the ciliary muscle to which it is attached . 通过晶状体及其所连着的睫状肌的动作，可以做到这一点。
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Cataracts are classified according to the age of the individual, etiology, and the morphologic characteristics of the opacity . 白内障是根据患者的年龄、病因和晶状体混浊的形态学特征来分类的。
