In Brief:

• Bionic eyes are already in development and could alleviate sight issues for hundreds of millions suffering from visual impairments or blindness.
• The mechanical eyes could also provide enhanced sight so cybernetic humans could see more of the electromagnetic spectrum.

With an estimated 285 million people worldwide with visual impairment, many treatments and technological innovations have long been in development. The panacea of restoring sight to the blind is the stuff of sci-fi: the bionic eye.

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