After their transplants, the researchers followed the volunteers for two years. They concluded that the implants were safe to use and restored the thickness and curvature of the recipients’ natural corneas. Before the operation, 14 of the 20 participants were legally blind, and the others were visually impaired. Two years later, three of the participants who had been blind prior to the study had 20/20 vision, thanks to a combination of the bioengineered corneas and the use of contact lenses or glasses. For the others, their vision improved to an average of 20/26 with contacts (in the Indian group) and 20/58 with glasses (in the Iranian group).
Christopher Starr, an
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