cataract

详细解释:n. 大瀑布, 奔流, 暴雨, 白内障
【医】 内障, 白内障

英语解释：

名词 cataract:

clouding of the natural lens of the eyea large waterfall; violent rush of water over a precipice

例句：

He has developed a cataract.他患上了白内障。