通常叫做白内障
Often called cataracts
以上为机器翻译结果，长、整句建议使用 人工翻译 。
移除由于混浊的瑕疵而变暗的晶体，通常叫做白内障，然后用人工晶体替换它们，这种技术已经存在超过半个世纪。
The ability to remove lenses darkened by cloudy imperfections, known as cataracts, and replace them with artificial lenses, is more than half a century old.
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