Medicine: Conquest of Cataract

For more than 3,000 years, doctors were balked in their efforts to restore anything like normal vision to elderly eyes clouded by cataracts. In modern times they have been able to cut into the eyeball, remove the cataract-clouded lens, and try to make up for the loss of the lens by spectacles. But they have not dared to insert a substitute in the eyeball. Now a British eye surgeon reports a way to do just that: a carefully ground lens made of plastic is slipped into the eyeball during the operation and stays there.

The lens in the normal eye is a...

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