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A pioneering procedure to regenerate the eye has successfully treated children with cataracts in China.
More than half of all cases of blindness are caused by cataracts - the clouding of the eye's lens.
An implanted lens is normally needed to restore sight, but the operation described in Nature activated stem cells in the eye to grow a new one.
Experts describe the breakthrough as one of the finest achievements in regenerative medicine.
The lens sits just behind the pupil and focuses light on to the retina.
About 20 million people are blind because of cataracts, which become more common with age - although some children are born with them.
Conventional treatment uses ultrasound to soften and break up the lens, which is then flushed out.
An artificial intraocular lens must then be implanted back into the eye, but this can result in complications, particularly in children.
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