Transplanting human corneas from cadavers can restore someone’s vision. But because of a tissue shortage, only 100,000 corneal transplants are performed worldwide annually — serving just 1% of the 10 million people who are stricken with corneal blindness.
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Bioengineers are making significant progress. They predict that within a few years we could have cornea substitutes that slip over the surface of the eye as easily as contact lenses and mesh neatly with surrounding tissue to form a protective barrier against the outside elements.