The cornea is a tough, five-layered membrane through which light is admitted to the interior of the eye. Behind the cornea is a chamber filled with clear, watery fluid, the aqueous humor, which separates the cornea from the crystalline lens. The lens itself is a flattened sphere constructed of a large number of transparent fibers arranged in layers. It is connected by ligaments to a ringlike muscle. This muscle by flattening the lens or making it more nearly spherical changes its focal length.
- membrane [ˈmembrein] n.膜
- admit [ədˈmit] v.许可进入
- chamber [ˈtʃeimbə] n. 有机物体内封闭的腔；室
- aqueous [ˈeikwiəs] adj.水的
- humor [ˈhju:mə] n. 体液
- crystalline [ˈkristəlain] adj.水晶的
- lens [lenz] n.透镜, 镜头
- flatten [ˈflætn] v. 使变平
- sphere [sfiə] n.球(体)
- ligament [ˈliɡəmənt] n.系带,韧带
- focal [ˈfəukəl] adj.焦点的
